ADS8638_14 Datasheet, PDF (42/76 Pages) Texas Instruments – 12-Bit, 1MSPS, 4-/8-Channel, Bipolar-Input, SAR Analog-to-Digital Converter with Software-Selectable Ranges

ADS8634
ADS8638
SBAS541A – MAY 2011 – REVISED AUGUST 2011
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Continued Operation in the Selected Mode for the ADS8638
Holding the DIN line low continuously (equivalent to writing '0' to all 16 bits) during device operation as per
Figure 85, continues device operation in the last selected mode (auto or manual). The device follows the range
selection from the configuration registers (address 10h to 13h). The the internal temperature sensor continues to
be read if the temperature sensor was selected during the last auto/manual mode frame.
Configuration Registers for the ADS8638
The configuration registers allow device configuration (signal range selection for individual channels, selection of
channels for auto sequence, enabling/disabling of the internal reference and temperature sensor, and
configuration of the AL_PD pin as either an alarm output or a power-down input). All registers can be reset to the
default values using the configuration register.
Reset-Device: Device Reset Register (Address = 01h; Page 0)
7
6
5
4
3
2
0
0
0
0
0
0
1
0
0
Reset-Dev
This register resets the device and assigns default values to all internal registers. The reset value for this register
is 00h; as a result, this bit is self-clearing.
Bits[7:1]
Bit 0
Must always be set to '0'
Reset-Dev
This bit initiates a software reset immediately after the 16th SCLK falling edge.
All registers in the device are assigned the reset values mentioned in Table 11 and Table 12.
0 = No reset
1 = Device reset
Aux-Config: Device Auxiliary Blocks Enable/Disable Control Register (Address = 06h; Page 0)
7
6
5
4
3
2
1
0
0
0
0
0
AL_PD Control
Int V_REF Enable
Temp Sensor Enable
0
This register controls the functionality of the AL_PD pin and enables/disables blocks such as the internal
reference and internal temperature sensor.
Bits[7:4]
Bit 3
Bit 2
Bit 1
Bit 0
Must always be set to '0'
AL_PD Control
This bit controls the functionality of the AL_PD pin.
0 = AL_PD pin functions as an alarm output pin
1 = AL_PD pin functions as a power-down control pin
Int V_REF Enable
This bit powers up the internal V_REF.
0 = Internal reference block is powered down at the next frame
1 = Internal reference block is powered up at the next frame
Temp Sensor Enable
This bit powers up the internal temperature sensor.
0 = Internal temperature sensor block is powered down from the next frame
1 = Internal temperature sensor block is powered up from the next frame
Must always be set to'0'
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