Loopback PCB

Fig. 194 Loopback PCB
Source
Revisions
Rev01
General description
This PCB is part of the ADC Loopback tutorial.
The LEDs indicate the state of the signals from the digital voltage card (Digital Voltage 3U 2v01). Furthermore eight of the signals (as documented in the section Signal description below) are first filtered and then output via the Ethernet connector to the ADC card (Analog LTC2311-16 3v01, Analog LTC2311-16 2vXX ).

Fig. 195 Functional areas of the Loopback PCB
Layout
The PCB is structured by functional areas as shown in the Fig. 195 on the right.
Connectors to the Digital Voltage Card
Connector 1: IPL1-115-01-L-D-K, top (green)
Connector 2: IPL1-120-01-L-D-K, left (blue)
Pin header for measuring all signals
Supply voltage state indicated by LEDs (3V3, 5V, 15V, 24V)
State of gate signals indicated by LEDs
State of remaining IOs indicated by LEDs
Low pass filter for filtering the gate signals
Ethernet connector to ADC Card
Signal description
Since the matching of the signal names between the PCBs used in the Loopback Tutorial is not intuitive, the following table matches the signal names of the Digital Voltage Card to the signal names on the Loopback PCB and the ADC card. Additionally, the name of the corresponding LED as marked on the Loopback PCB is given.
Connector 1: IPL1-115-01-L-D-K
Pin |
Digital voltage card |
Loopback PCB |
LED |
ADC card |
---|---|---|---|---|
1 |
VIN |
24V |
24V |
|
2 |
DIG_IO_P1 |
PWM_G1 |
LED_G1_D6 |
AIN_A_P4 |
3 |
DIG_IO_P2 |
PWM_G7 |
LED_G7_D6 |
AIN_B_P2 |
4 |
DIG_IO_P3 |
PWM_G2 |
LED_G2_D6 |
AIN_A_P3 |
5 |
DIG_IO_P4 |
PWM_G9 |
LED_G9_D6 |
|
6 |
DIG_IO_P5 |
PWM_G3 |
LED_G3_D6 |
AIN_A_P2 |
7 |
DIG_IO_P6 |
PWM_G10 |
LED_G10_D6 |
|
8 |
DIG_IO_P7 |
IO_P1 |
LED1_D5 |
|
9 |
DIG_IO_P8 |
IO_P2 |
LED2_D5 |
|
10 |
15V |
15V |
15V |
|
11 |
DIG_IO_P9 |
IO_P3 |
LED3_D5 |
|
12 |
DIG_IO_P10 |
IO_P4 |
LED4_D5 |
|
13 |
DIG_IO_P11 |
IO_P5 |
LED5_D5 |
|
14 |
DIG_IO_P12 |
IO_P6 |
LED6_D5 |
|
15 |
DIG_IO_P13 |
IO_P7 |
LED7_D5 |

Fig. 196 Netnames of connector 1 (IPL1-115-01-L-D-K) on Digital voltage card

Fig. 197 Netnames of connector 1 (IPL1-115-01-L-D-K) on Loopback PCB

Fig. 198 Netnames of Ethernet connector on ADC card
Connector 2: IPL1-120-01-L-D-K
Pin |
Digital voltage card |
Loopback PCB |
LED |
ADC card |
---|---|---|---|---|
1 |
VIN |
24V |
24V |
|
2 |
DIG_IO_P14 |
PWM_G4 |
LED_G4_D6 |
AIN_A_P1 |
3 |
DIG_IO_P15 |
PWM_G8 |
LED_G8_D6 |
AIN_B_P1 |
4 |
DIG_IO_P16 |
PWM_G5 |
LED_G5_D6 |
AIN_B_P4 |
5 |
DIG_IO_P17 |
PWM_G11 |
LED_G11_D6 |
|
6 |
DIG_IO_P18 |
PWM_G6 |
LED_G6_D6 |
AIN_B_P3 |
7 |
DIG_IO_P19 |
PWM_G12 |
LED_G12_D6 |
|
8 |
DIG_IO_P20 |
IO_P8 |
LED8_D5 |
|
9 |
DIG_IO_P21 |
IO_P9 |
LED9_D5 |
|
10 |
3V3 |
3V3 |
3V3 |
|
11 |
DIG_IO_P22 |
IO_P10 |
LED10_D5 |
|
12 |
DIG_IO_P23 |
IO_P11 |
LED11_D5 |
|
13 |
DIG_IO_P24 |
IO_P12 |
LED12_D5 |
|
14 |
DIG_IO_P25 |
IO_P13 |
LED13_D5 |
|
15 |
DIG_IO_P26 |
IO_P14 |
LED14_D5 |
|
16 |
DIG_IO_P27 |
IO_P15 |
LED15_D5 |
|
17 |
DIG_IO_P28 |
IO_P16 |
LED16_D5 |
|
18 |
DIG_IO_P29 |
IO_P17 |
LED17_D5 |
|
19 |
DIG_IO_P30 |
IO_P18 |
LED18_D5 |
|
20 |
5V |
5V |
5V |

Fig. 199 Netnames of connector 2 (IPL1-120-01-L-D-K) on Digital voltage card

Fig. 200 Netnames of connector 2 (IPL1-120-01-L-D-K) on Loopback PCB

Fig. 201 Netnames of Ethernet connector on ADC card
Hint
To sum this up: The signals on Pin 2 to Pin 7 on both connectors (IPL1-115-01-L-D-K & IPL1-120-01-L-D-K) are used for the gate signals in the Loopback tutorial. P2 being the gate signal for the first high side switch, P3 for the corresponding low side switch, P4 for the second high side switch and so on. All Gate signals for the high side switches (Pin 2, Pin 4, Pin 6) and the first for the low side switches (Pin 3) are filtered and can be read back by the ADC card.
Downloads
Rev01
Designer
Designed by Nina Diringer (TH Nürnberg), 07/2022