Texas Instruments ADS1259EVM, User Manual

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Power Supplies
All logic levels on J7 are 3.3V CMOS, except for the I
2
C™ pins. These pins conform to 3.3V I
2
C rules.
Table 2 describes the J7 serial interface pins.
Table 2. J7: Serial Data Interface Pins
Pin No. Pin Name Signal Name I/O Type Pull-up Function
J7.1 CNTL Unused — — —
J7.2 GPIO0 START In High ADS1259 START Pin
J7.3 CLKX SCLK In None ADS1259/PGA280 SPI clock
J7.4 DGND DGND In/Out None Digital Ground
J7.5 CLKR Unused — — —
J7.6 GPIO1 RST/PDWN In High ADS1259 RST/PDWN
J7.7 FSX CS — — ADS1259 SPI Chip Select
J7.8 GPIO2 DOUT Out High PGA280 SPI data out
J7.9 FSR Unused — None —
J7.10 DGND DGND In/Out None Digital Ground
J7.11 DX DIN In None ADS1259 SPI data in
J7.12 GPIO3 CS In High PGA280 SPI Chip Select
J7.13 DR DOUT Out None ADS1259 SPI data out
J7.14 GPIO4 Unused — None —
J7.15 INT DRDY Out None ADS1259 SPI Data Ready signal
J7.16 SCL SCL I
2
C n/a I
2
C clock
J7.17 TOUT CLK In None Can be used to provide a clock from
a processor
J7.18 DGND DGND In/Out None Digital Ground
J7.19 GPIO5 EXTCLK In None External Clock input
J7.20 SDA SDA I
2
C n/a I
2
C data
Many pins on J7 have weak pull-up/-down resistors. These resistors provide default settings for many of
the control pins. Furthermore, many pins on J7 correspond directly to pins on the ADS1259. See the
ADS1259 product data sheet for complete details on these pins.
4 Power Supplies
J11 is the power-supply input connector. Table 3 lists the configuration details for J11. The ADS1259 and
PGA280 output amplifier are powered from +5V that can be supplied through the +5VA supply that can be
found on pin J11.3. An additional bipolar supply is needed to power the PGA280 tVA and –VA
through pins J11.1 and J11.2.
Table 3. J11 Configuration: Power-Supply Input
Pin No. Pin Name Function Required
J11.1 +VA +10V to +15V Yes
J11.2 –VA -10V to -15V Yes
J11.3 +5VA +5V analog supply Always
J11.4 -5VA -5V analog supply No
J11.5 DGND Digital ground input Yes
J11.6 AGND Analog ground input Yes
J11.7 +1.8VD 1.8V digital supply No
J11.8 VD1 Not used No
J11.9 +3.3VD 3.3V digital supply Always
J11.10 +5VD +5V No
7 SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK
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