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SBAS457A

– OCTOBER 2010 – REVISED JULY 2011

Bits[7:5]

DR[2:0]: Data rate

These bits control the data rate setting.

000 : 8SPS

100 : 128SPS (default)

001 : 16SPS

101 : 250SPS

010 : 32SPS

110 : 475SPS

011 : 64SPS

111 : 860SPS

Bit 4

TS_MODE: Temperature sensor mode

This bit configures the ADC to convert temperature or input signals.

0 : ADC mode (default)

1 : Temperature sensor mode

Bit 3

PULL_UP_EN: Pull-up enable

This bit enables a weak pull-up resistor on the DOUT pin when CS is high. When enabled, a 400k

Ω resistor

connects the bus line to supply when CS is high. When disabled, the DOUT pin floats when CS is high.

0 : Pull-up resistor disabled on DOUT pin (default)

1 : Pull-up resistor enabled on DOUT pin

Bits[2:0]

NOP: No operation

The NOP bits control whether data are written to the Config Register or not. In order for data to be written to

the Config Register, the NOP bits must be written as '01'. Any other value written to the NOP bits results in a

NOP command. This means that DIN can be held high or low during SCLK pulses without data being written to

the Config Register.

00 : Invalid data, do not update the contents of the Config Register.

01 : Valid data, update the Config Register (default)

10 : Invalid data, do not update the contents of the Config Register.

11: Invalid data, do not update the contents of the Config Register.

Bit 0

CNV_RDY_FL: Conversion ready flag

This bit is active low and indicates when data are ready from the converter. When it is high, a conversion is not

yet ready and is in process. The purpose of the conversion ready flag bit is to return the DOUT pin line to a

high state to prepare for the falling edge from new data.

0 : Data ready, no conversion in progress

1 : Data not ready, conversion in progress (default)

Copyright

© 2010–2011, Texas Instruments Incorporated

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