Texas Instruments ADS1241, User Manual, Page: 3 / 10

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3 Digital Interface
4 Power Supplies
Digital Interface
The ADS1241MEVM is designed to easily interface with multiple control platforms. Samtec part
numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin,
dual-row, header/socket combination at J2. This header/socket provides access to the digital
control and serial data pins of the ADS1241. Consult Samtec at
www.samtec.com or call
1-800-SAMTEC-9 for a variety of mating connector options.
Table 2. Digital Interface Pinout
Pin Number Signal Description
J2.1 DSYNC Synchronization control
J2.2 PWDN Power down
J2.3 SCLK Serial clock
J2.4 DGND Digital ground
J2.5 Unused
J2.6 GPIO1 Oscillator kickstart (see Section 5.3.1.1 )
J2.7 CS Chip select - Active low signal, enables data transfer. Frame sync on DSP host systems.
J2.8 GPIO2 Oscillator kickstart enable (see Section 5.3.1.1 )
J2.9 Unused
J2.10 DGND Digital ground
J2.11 DIN Serial data input to ADS1241 from host
J2.12 BUFEN Buffer enable
J2.13 DOUT Serial data output from ADS1241 to host
J2.14 POL Serial clock polarity
J2.15 DRDY Data ready
J2.16 SCL I
2
C bus serial clock
J2.17 TOUT External clock input to ADS1241
J2.18 DGND Digital ground
J2.19 RESET Resets ADS1241 device
J2.20 SDA I
2
C bus data line
J3 provides connection to the common power bus for the ADS1241MEVM. Power is supplied on
the pins listed in
Table 3 .
Table 3. Power Supply Pinout
Signal Pin Number Signal
Unused 1 2 Unused
+5VA 3 4 Unused
AGND 5 6 DGND
Unused 7 8 Unused
+3.3VD 9 10 +5VD
When power is supplied to J3, J4 allows for either 3.3V of 5V to be applied to the digital sections
of the ADS1241. J4 also provides for a method of measuring AVDD and DVDD supply currents
if the shunts on J4.1-2 and J4.3-4 are removed and a current meter is connected between the
appropriate pins. See the schematic and
Figure 1 for details.
ADS1241MEVM SBAU106 – October 2004 3