Datasheet

ADS1146

ADS1147

ADS1148

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SBAS453F –JULY 2009–REVISED APRIL 2012

ADS1147 AND ADS1148 DETAILED REGISTER DEFINITIONS (continued)

GPIOCFG—GPIO Configuration Register. The GPIO and analog pins are shared as follows:

GPIO0 shared with REFP0

GPIO1 shared with REFN0

GPIO2 shared with AIN2

GPIO3 shared with AIN3

GPIO4 shared with AIN4 (ADS1148)

GPIO5 shared with AIN5 (ADS1148)

GPIO6 shared with AIN6 (ADS1148)

GPIO7 shared with AIN7 (ADS1148)

GPIOCFG - ADDRESS 0Ch RESET VALUE = 00h

DEVICE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

ADS1148 IOCFG7 IOCFG6 IOCFG5 IOCFG4 IOCFG3 IOCFG2 IOCFG1 IOCFG0

ADS1147 0 0 0 0 IOCFG3 IOCFG2 IOCFG1 IOCFG0

Bits[7:0] IOCFG[7:0]

These bits enable the GPIO because the GPIO pins are shared with the analog pins. Note that the

ADS1148 uses all the IOCFG bits, whereas the ADS1147 uses only bits 3:0.

0 = The pin is used as an analog input (default)

1 = The pin is used as a GPIO pin

GPIODIR—GPIO Direction Register

GPIODIR - ADDRESS 0Dh RESET VALUE = 00h

DEVICE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

ADS1148 IODIR7 IODIR6 IODIR5 IODIR4 IODIR3 IODIR2 IODIR1 IODIR0

ADS1147 0 0 0 0 IODIR3 IODIR2 IODIR1 IODIR0

Bits[7:0] IODIR[7:0]

These bits control the direction of the GPIO when enabled by the IOCFG bits. Note that the

ADS1148 uses all the IODIR bits, whereas the ADS1147 uses only bits 3:0.

0 = The GPIO is an output (default)

1 = The GPIO is an input

GPIODAT—GPIO Data Register

GPIODAT - ADDRESS 0Eh RESET VALUE = 00h

DEVICE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

ADS1148 IODAT7 IODAT6 IODAT5 IODAT4 IODAT3 IODAT2 IODAT1 IODAT0

ADS1147 0 0 0 0 IODAT3 IODAT2 IODAT1 IODAT0

Bits[7:0] IODAT[7:0]

If a GPIO pin is enabled in the GPIOCFG register and configured as an output in the GPIO

Direction register (GPIODIR), the value written to this register appears on the appropriate GPIO

pin. If a GPIO pin is configured as an input in GPIODIR, reading this register returns the value of

the digital I/O pins. Note that the ADS1148 uses all eight IODAT bits, while the ADS1147 uses only

bits 3:0.

Product Folder Link(s): ADS1146 ADS1147 ADS1148