UM0305 User manual
12-channels integrated PSE line manager STE12PS rev2 evaluation board
Purpose and scope
This document describes how to setup and use the STE12PS rev2 evaluation board, which analyzes the performance of the STE12PS device. There are two versions of the STE12PS rev2 evaluation board:
with a BGA socket in which the STE12PS device is placed without a BGA socket for the STE12PS device (the device is soldered directly on the board and thermal tests must be performed on the board) an introduction to the Power over Ethernet solution as defined by IEEE 802.3af a presentation of the board that implements Power over Ethernet (PoE) and of possible working scenarios a description of the STE12PS rev2 evaluation board set (power supply, boards' connection and available interfaces)
This manual contains:
November 2006
Rev 1
1/20
www.st.com
Contents
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Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Power over Ethernet with the STE12PS . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.1 1.1.2 IEEE 802.3af . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Typical application example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 1.3
Evaluation board overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Power sourcing equipment (PSE) implementation . . . . . . . . . . . . . . . . . . . 5
1.3.1 1.3.2 1.3.3 1.3.4 1.3.5 1.3.6 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Dip switches, configuration jumpers and reset . . . . . . . . . . . . . . . . . . . . 5 LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Parallel port configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Optocoupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Jumper configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2
STE12PS rev2 evaluation board setup . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1 2.2 2.3 2.4 PoE application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Stand-alone setup with power delivered on the spare wires . . . . . . . . . . 15 Stand-alone setup with power delivered on the data wires . . . . . . . . . . . 16 Setups using a PC to monitor and control the board . . . . . . . . . . . . . . . . 16
2.4.1 2.4.2 Connecting the board to a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Testing data link performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3 4
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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Introduction
1
1.1
Introduction
Power over Ethernet with the STE12PS
The STE12PS implements the Power over Ethernet standard IEEE 802.3af. This standard describes how to provide power to a device attached to the LAN through the Ethernet port.
1.1.1
IEEE 802.3af
The standard supports optionally powering a 10BASE-T, 100BASE-TX or 1000BASE-T DTE device via the power interface (PI). The power sourcing equipment (PSE) is located at an endpoint or midspan, separate from and between the MDIs, and provides power to the powered device (PD) over the link section. The PSE detection protocol distinguishes compatible PDs from non-compatible devices and precludes the application of power and possible damage to non-compatible devices. The PSE monitors the maintain power signature (MPS) and removes power when it is no longer requested or required. Optional management function requirements are specified.
1.1.2
Typical application example
PSE may be placed in two locations with respect to the link segment, either coincident with the DTE/repeater or midspan. A PSE that is coincident with the DTE/repeater is an endpoint PSE. A PSE that is located within a link segment that is distinctly separate from and between the MDIs is a midspan PSE. Figure 1. Endpoint or midspan application (alternative B)
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1.2
Evaluation board overview
The board has a 12 port PoE PSE system which can provide power on the spare or data wires. Figure 2. Board overview
LEDs Jumpers data pair
STE12PS Jumpers spare pair Jumpers boost
Dip switches, Configuration jumpers and Reset
Power supply Optocoupler
Parallel port
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Introduction
1.3
Power sourcing equipment (PSE) implementation
The 12 port PSE uses the STE12PS device. It is possible to identify several sections on the board (see Figure 2) that are described in this section.
1.3.1
Power supply
The board works with Vbat (48V), 10V and 3.3V. For test purposes all the power supplies can be provided externally through the connectors B3 (Vbat), B4 (3.3V), B5 (10V) and B6 (GND). Vbat can be provided also through the jack connector J16 (GND external, 48V central pin). Usually only the external power supply Vbat is required (S/U PIN=1 or Float). The 3.3V is generated using an integrated switch mode power supply (SMPS) and the 10V is generated using a linear regulator integrated in the STE12PS. When a single power supply Vbat is used the current required is about 10mA + 500mA for each channel turned on at the maximum delivered power. When all the power supplies are provided correctly, D86, D85 and D84 are turned on.
1.3.2
Dip switches, configuration jumpers and reset
SW3 connects directly to the STE12PS RESETN pin, it is used for hardware reset of the device. Two multiple dip switches, SW4 and SW2, set and configure the STE12PS device. (0 = switch on, 1 = switch off). The I2C address can be changed via SW2. Figure 3. Dip switches SW4 and SW2 and SENSEPROG0 and SENSEPROG1
Rsense jumpers Oscillator jumpers
A/C disconnection
SW4 dip switch
SW2 dip switch
SW3 reset switch
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Introduction Table 1. Configuration switch SW4
SW4 NC Description (0 = switch on, 1 = switch off) Not connected SMPS (switch mode power supply) mode selector (supplier / user). When off, the device works as a DC-DC converter controller. When on, an external power supply must be used to generate the 3.3 V input power. Auto start mode enable. 0: disabled: all ports are disabled after reset, neither detection, classification nor power on is performed (OP_MODE[1:0] bits in Global_cfg1 register set to power down at the reset event) 1: enabled: all the ports are automatically enabled, detection, classification and power on are performed (OP_MODE[1:0] bits in Global_cfg1 register set to auto after the reset event) 12, 8 or 4 channel select. x=0, 1. 00: 12 channel configuration (15W) 01: not available 10: not available 11: 4 boost configuration (30W) A or B alternative configuration mode select. 0: alternative B (midspan-PSE) 1: alternative A (endpoint-PSE)
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Default x
S/UPIN
1
AUTO_START
1
CH_NUMx
00
A_BN_SEL
0
Table 2.
Configuration switch SW2
SW2 Description (0 = switch on, 1 = switch off) Not connected Default x
NC IC2_ADDR4 IC2_ADDR3 IC2_ADDR2 IC2_ADDR1 IC2_ADDR0
Device address for the I2C interface
0
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UM0305 Table 3. Rsense settings (JP91, JP90)
Description (0 = short; 1 = open)
Introduction
Jumper name
Default
Programs the sensing resistance value connected to the device. A mismatch between the mounted resistance and the programmed value can damage the device so always verify that the programmed value matches the mounted SENSE resistance. R18 and R19 are not mounted on the default configuration. These SENSEPROG0(JP90) two resistors connect the SENSEPROGx pins to the 3.3 V power supply, so they must be mounted to get a high level. SENSEPROG1(JP91) Preset pins for sensing resistors: 00: Rs=0.5 (JP91 = short; JP90 = short) 01: Rs=1 (JP91 = short; JP90 = open)(1) 10: Rs=1.5 (JP91 = open; JP90 = short)(1) 11: Rs=2 . (JP91 = open; JP90 = open)(1)
1. Verify the R18 and R19 are mounted
00
Table 4.
Oscillator settings (JP25, JP26)
Description Configures whether a quartz or an RC oscillator is used to generate the device clock reference. JP25 = short; JP26 = open (RC oscillator) JP25 = open; JP26 = short (6MHz crystal) Default
Jumper name
JP25 JP26
Crystal
Table 5.
AC disconnection setting (JP - AC1)
Description Enables or disables the built in AC disconnection feature. JP - AC1 = short; AC disconnection enabled JP - AC1 = open; AC disconnection disabled Default
Jumper name
JP - AC1
Enabled
1.3.3
LED
There are 5 bars of 12 LEDs (one for each channel). When the board is configured in auto mode the LEDs turn on and off according to the detection of the conditions described inTable 6. Table 6.
Bar color Green Red Red Red Yellow
LEDs
Description POK: power ok: the device attached is powered OVLD: current overload condition (Icut is overthreshold) OVCURR: overcurrent or detection failed condition detected DISCON: AC/DC disconnection flag DTE/CLASS: channels current detection/classification condition Default 0 0 0 0 0
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1.3.4
Parallel port configuration
The parallel port is used as an I2C master that (through the I2C interface) controls the reading and writing of the internal registers of the device. The STE12PS control software can configure and read all the registers of the device. Figure 4. I2C interface
SDA SCL
PC parallel port
STE12PS
The following pins of the parallel port implement the I2C interface: Figure 5. Parallel port pin-out
(S4) pin13: Interupt_PC: this signal is generated by the STE12PS according to the programmed event (disconnection, overload, overcurrent...). (S5) pin12: SDA_OUT_PC serial data from the PC. (D1) pin3: SDA_IN serial data from the PC. (D2) pin4: SCL_IN serial clock from the PC. (D7) pin9 +5V is configured as output and gives power to the optocoupler. (D5) pin7 +5V is configured as output and gives power to the optocoupler.
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Introduction
1.3.5
Optocoupler
The STE12PS has an I2C interface to allow access to the internal device registers. The external controller can be fully isolated from the Ethernet port by using optocouplers on I2C signals and using the integrated 3.3V SMPS power source.
1.3.6
Jumper configuration
Channels CH1, CH2, CH3 and CH4 can operate in standard mode (15 Watt) or boost mode (30 Watt). The board is configured in standard or boost mode through the jumpers as described in Table 10. The labels for the boost or standard jumpers follow these naming rules: JPxch#_ch#, where JP=jumper, x= B (boost) or S (standard), ch#_ch# (channels that are shorted together). The following errors exist on the silk layer: Table 7. Label errors on the PCB
Wrong label JPS6_2 JPB11_11 JPS11_10 JPD8_4 JPB6_2 JPB11_10 JPS11_11 JPB8_4 Correct label
Figure 6.
Jumper label errors on the PCB
Wrong labels JPS6_2 JPB11_11 JPS11_10 Label JPS6_2 = JPB6_2 Label JPB11_11 = JPB11_10 Label JPS11_10 = JPS11_11
JPD8_4
Label JPD8_4 = JPB8_4
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Standard configuration
Figure 7 shows the jumper configuration required to use all the channels in standard mode. Figure 7. Jumper setting for standard configuration
JPS5_5 JPS6_6
Standard configuration
JPS11_10 JPS7_7 JPS12_12
JPS8_8
To provide 30 W power for each port two output channels are put in parallel and all the measurements are performed on the first 4 channels. Table 8. Auto mode 30 W channel settings
Description CH1 and CH5 in parallel and enabled CH2 and CH6 in parallel and enabled CH3 and CH7 in parallel and enabled CH4 and CH8 in parallel and enabled
CHx 30 W in auto mode CH1 CH2 CH3 CH4
For test purposes the channels can be shorted together on the evaluation board according to Table 9: Table 9. Manual mode 30 W channels settings
Description(1) CH1 and CH5 in parallel CH2 and CH6 in parallel CH3 and CH7 in parallel CH4 and CH8 in parallel CH9 and CH12 in parallel CH10 and CH11 in parallel
CHx 30 W in manual mode CH1 CH2 CH3 CH4 CH9 CH10
1. When the board is running in manual mode, each channel should be managed (enabled and disabled) by an external microprocessor.
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Introduction
Boost configuration
Figure 8. Jumper setting for boost configuration
JPB5_1 JPS6_2 JPB11_11 JPB7_3 Boost configuration
JPB12_9 JPD8_4
To work in boost mode the switches CH_NUM0 and CH_NUM1 must be set to 11. Table 10. Standard or boost mode configuration
Description Standard channel JP1(JPS5_5), JP5(JPB5_1) JP1 CH1 JP2(JPS6_6), JP6(JPS6_2) JP2 CH2 JP3(JPS7_7), JP7(JPB7_3) JP3 CH3 JP4(JPS8_8), JP8(JPD8_4) JP4 CH4 Boost channel JP5 CH1 (CH1 and CH5 short together) JP6 CH2 (CH2 and CH6 short together) JP7 CH3 (CH3 and CH7 short together) JP8 CH4 (CH4 and CH8 short together)
Jumper (label)(1)
1. Only one jumper of these couples can be mounted; both jumpers are not allowed.
When the device is not in auto mode it is possible to have 6 channels that provide 30 W. To use the remaining channels in boost mode the following jumpers must be set. Table 11. Boost channels when not in auto mode
Description Jumper (label) Standard channel JPS11_11(JPS11_10), JPB11_10(JPB11_11) JPS12_12(JPS12_12), JPB12_9(JPB12_9) JPS11_11 CH11 JPS12_12 CH12 Boost channel JPB11_10 CH11 (CH11 and CH10 short together) JPB12_9 CH12 (CH12 and CH9 short together)
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Alternative mode
The evaluation board can be configured to work in Alternative A or Alternative B mode. According to the alternative mode, the power is delivered on different Ethernet pairs according to Table 12. Table 12. PSE pinout alternatives
Alternative A (MDI) Positive Vpor t Positive Vpor t Negative Vpor t Positive Vpor t Positive Vpor t Negative Vpor t Negative Vpor t Negative Vpor t Alternative B (All)
Conductor 1 2 3 4 5 6 7 8
Each port has three jumpers:
JPPor t#A (where Port# is Port number from 1 to 12) JPPor t#B JPPor t#D
Jumper JPVBAT_D connects all the 12 port pins 4 and 5 (spare wires) to the connectors. This jumper must be set when Alternative B is select. The jumpers are used, in accordance with Table 13, to set if the power is provided on the:
data wires (Alternative A) or spare (Alternative B) wires of the ports. Power on data or spare wires configuration
Alternative A (MDI) Data pairs Shor t Shor t Open Open Open Open Shor t Shor t Alternative B (All) Spare pairs
Table 13.
Jumper (label)(1) JPxA (JxA) JPxB (JxB) JPxD (JxD) JPVBAT_D
1. Only one jumper of the couples in the table must be mounted; both jumpers are not allowed
Figure 8 and Figure 9 show the board configuration required to set the board in Alternative A and B modes.
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Introduction
Power on data wires
Jumpers shorted
Jumpers open
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Introduction Figure 10. Jumpers configuration for power on spare pairs (Alternative B)
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Jumpers open
Jumpers shorted Power on spare wires
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STE12PS rev2 evaluation board setup
2
STE12PS rev2 evaluation board setup
STE12PS reference setup requires the following:
STE12PS rev2 evaluation board 1 DC power supply 48 V (10 mA + 500 mA x channel) 1 PC with a parallel port, with controller software running 1 parallel cable 1 CAT 5 UTP with RJ45 connectors ethernet cables 1 traffic source optional (Smartbits or PC) External PD
2.1
PoE application
All the following configurations use an external power supply so S/UPIN = 1. AUTO_START is set to 1 so that the controller autonomously performs detection, classification and power-on command (without needing host commands via the I2C interface). The voltage LEDs Vbat(D84), V3.3(D85) and V10(D86) are turned on. When the board is switched on, the current sunk from the 48 V is around 18 mA without any PD attached to the STE12PS evaluation rev2 board.
2.2
Stand-alone setup with power delivered on the spare wires
This configuration permits some basic test to be performed to verify that the board is working. This setup requires the minimum external instrumentation. Refer to Figure 9 to setup the board in Alternative B mode. Figure 11. Stand-alone setup with power delivered on the spare wires
Signal wires LED
Signal wires
LED displays the powered channel
Power through spare wires
STE12PS Spare wires External PD
Parallel
Power supply Standard parallel cable 48 V supply
On the LED bars the yellow LED scrolls through the 12 channels, this behavior means the detection phase is started. When a valid PD is connected to a PSE port, the green LED is turned on (corresponding to the connected port).
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STE12PS rev2 evaluation board setup
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2.3
Stand-alone setup with power delivered on the data wires
This configuration is always stand-alone, but the board is configured to deliver power on the data wires. To configure the board in this manner, follow Figure 9. Figure 12. Stand-alone setup with power delivered on the data wires
Signal wires LED
Signal wires
External PD
LED displays the powered channel
Power through data wires Spare wires
STE12PS
Parallel
Power supply Standard parallel cable 48 V supply
2.4
Setups using a PC to monitor and control the board
The STE12PS I2C controller GUI software can access the internal registers of the STE12PS device directly. The PC communicates with the board using the parallel port which has an I2C protocol interface. If the setup is correct on the PC it is possible to monitor the status of the board through the Status window that displays the same information as the LED bars. The software also makes it possible to read all the registers of the device. Figure 13. Status window
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STE12PS rev2 evaluation board setup
2.4.1
Connecting the board to a PC
Figure 14 shows the evaluation board connected to a PC with a standard parallel cable.. By configuring the boards, the same setup can be used to deliver power on the data wires. Figure 14. Evaluation board controlled through the STE12PS I2C controller GUI
Signal wires LED
Signal wires
LED displays the powered channel
Power through spare wires
STE12PS Spare wires External PD
Parallel STE12PS software
Power supply
48 V supply
Standard parallel cable is used for the connections
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STE12PS rev2 evaluation board setup
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2.4.2
Testing data link performance
This setup uses a traffic generator to test the data link performance when power is provided either on the spare or data wires. Do not connect the traffic generator to the signal pairs connector when the power is delivered to data pairs. Figure 15. Data and power delivered through the signal wires
Signal wires LED
Signal wires
External PD
LED displays the powered channel
Data and power through data wires Spare wires
STE12PS
Parallel Data on Ethernet data pairs
Power supply
48 V supply
STE12PS software
Smar tBits
Figure 16. Data + power delivered through the spare wires
Signal wires LED
Signal wires
Data and power through spare wires
LED displays the powered channel
STE12PS Spare wires External PD
Parallel Data on Ethernet data pairs
Power supply
48 V supply
STE12PS software
Smar tBits
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Definitions
3
Definitions
Table 14.
MPS PD PI PSE SELV
Acronyms used in this document
Maintain power signature Powered device Power interface Power sourcing equipment Safety extra low voltage
4
Revision history
Table 15.
Date 16-Nov-2006
Document revision history
Revision 1 Initial release. Changes
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