MAX11253 Datasheet, PDF (44/51 Pages) Maxim Integrated Products – Longer Battery Life for Portable Applications

MAX11253
16-Bit, 6-Channel, 64ksps, 6.2nV/√Hz PGA,
Delta-Sigma ADC with SPI Interface
GPIO_CTRL: GPIO Control Register (Read/Write)
BIT NAME
DEFAULT
Default = 0x4x
GPIO1_EN GPIO0_EN
0
1
DIR1
0
DIR0
0
DIO1
X
DIO0
X
This register controls the direction and values of the general-purpose I/O (GPIO) pins.
BIT NAME
GPIO1_EN
GPIO0_EN
DESCRIPTION
This bit selects the functionality of the GPIO1/SYNC pin. Set this bit to ‘1’ to use the pin as GPIO, or
set the bit to ‘0’ to use the pin as SYNC input.
This bit selects the functionality of the GPIO0/CLK pin. Set this bit to ‘1’ to use the pin as GPIO, or set
the bit to ‘0’ to use the pin as external clock input.
DIR[1:0]
The ‘direction’ bits configure the GPIO pins either as input or output. DIR1 corresponds to GPIO1,
while DIR0 controls GPIO0. Set the DIR bit to ‘1’ to configure the GPIO pin as output. The output
value of the GPIO pin is determined by the value of the DIO bit. Set the DIR bit to ‘0’ to configure the
associated GPIO pin as input. The logic input value of the GPIO pin can be read back from the DIO bit.
DIO[1:0]
The ‘data input/output’ bits reflect the status of the GPIO pins. DIO1 corresponds to GPIO1, while
DIO0 corresponds to GPIO0. If the GPIO pin is configured as output, the pin is driven to the logic value
of DIO. If the GPIO pin is configured as input, DIO reflects the logic value seen at the pin.
DELAY: Delay Register (Read/Write)
BIT NAME
DEFAULT
Default = 0x0000
MUX[7:0]
0x00
GPO[7:0]
0x00
BIT NAME
MUX[7:0]
GPO[7:0]
DESCRIPTION
Used to program the mux delay. The mux delay ranges from 4µs to 1.02ms. The default value of 0x00
corresponds to no delay. 1 LSB = 4µs of delay.
Used to program the GPO/GPIO delay. The GPO/GPIO delay ranges from 20µs to 5.1ms. The default
value of 0x00 corresponds to no delay. 1 LSB = 20µs of delay.
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