Loopback PCB

Fig. 225 Loopback PCB

Source

• Loopback PCB repository

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. 226 Functional areas of the Loopback PCB

Layout

The PCB is structured by functional areas as shown in the Fig. 226 on the right.

1. 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)

2. Pin header for measuring all signals

3. Supply voltage state indicated by LEDs (3V3, 5V, 15V, 24V)

4. State of gate signals indicated by LEDs

5. State of remaining IOs indicated by LEDs

6. Low pass filter for filtering the gate signals

7. 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

Table 114 Signal matching of connector 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. 227 Netnames of connector 1 (IPL1-115-01-L-D-K) on Digital voltage card

Fig. 228 Netnames of connector 1 (IPL1-115-01-L-D-K) on Loopback PCB

Fig. 229 Netnames of Ethernet connector on ADC card

Connector 2: IPL1-120-01-L-D-K

Table 115 Signal matching of connector 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. 230 Netnames of connector 2 (IPL1-120-01-L-D-K) on Digital voltage card

Fig. 231 Netnames of connector 2 (IPL1-120-01-L-D-K) on Loopback PCB

Fig. 232 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

• Schematics

• Bill of Material

• Assembly Drawing

Designer

Designed by Nina Diringer (TH Nürnberg), 07/2022