Texas Instruments ADS1x48EVM, User Manual, Page: 11 / 48

3.4 Digital Interface
The ADS1x48 devices support the digital SPI and functional modes as detailed in the 24-bit ADS1248 data
sheet or the 16-bit ADS1148 data sheet . As stated in Section 3.1 , the PAMBoard operates at a 3.3-V logic level
provided by the host computer and the ADS1x48EVM board uses this same 3.3-V logic level for DVDD.
Digital interface connections from the ADS1x48EVM to the PAMBoard include power, I
2
C, SPI, and a GPIO
connection used to trigger an interrupt at the end of conversion that signifies new data are available. The digital
connections are highlighted in the silkscreen shown in
Figure 3-5 and are described in detail in Table 3-2 . Use
these connection points for troubleshooting the SPI communication with a logic analyzer or to attach an external
MCU to control the ADS1x48EVM without the PAMBoard.
Figure 3-5. ADS1x48EVM-to-PAMBoard Connections
Table 3-2. ADS1x48EVM Header Pinout and Description
Description Connector Connector Description Description Connector Connector Connector
3.3 V
J1:1 J3:21 5 V J4:40 J2:20
GND
J1:2 J3:22 GND J4:39 J2:19
J1:3 J3:23 J4:38 J2:18
J1:4 J3:24 RESET J4:37 J2:17
J1:5 J3:25 J4:36 J2:16
J1:6 J3:26 J4:35 J2:15 DIN
SPI SCLK
J1:7 J3:27 J4:34 J2:14
DOUT/DRDY
J1:8 J3:28 START J4:33 J2:13
I
2
C SCL J1:9 J3:29 J4:32 J2:12 SPI CS
I
2
C SDA J1:10 J3:30 DRDY J4:31 J2:11 SPI CS
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SBAU378A – SEPTEMBER 2021 – REVISED JANUARY 2022
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ADS1x48EVM Evaluation Module 11
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