AD7150 Analog Devices, AD7150 Datasheet - Page 15

• Manufacturer Part Number: AD7150
• Description: Ultra-Low Power, 2-Channel, Capacitance Converter for Proximity Sensing
• Manufacturer: Analog Devices

Specifications of AD7150

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: n/a
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: 0.5 pF,1 pF,2 pF,4 pF
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

STATUS REGISTER
Address Pointer 0x00
8 Bits, Read-Only, Default Value 0x53 Before Conversion, 0x54 After Conversion
The status register indicates the status of the part. The register can be read via the 2-wire serial interface to query the status of the outputs,
check the CDC finished conversion, and check whether the CAPDAC has been changed by the autoCAPDAC function.
Table 6. Status Register Bit Map
Bit
Mnemonic
Default
Table 7. Status Register Bit Descriptions
Bit
7
6
5
4
3
2
1
0
Mnemonic
PwrDown
DacStep2
OUT2
DacStep1
OUT1
C1/C2
RDY2
RDY1
Description
PwrDown = 1 indicates that the part is in a power-down mode or that the part V
monitor threshold voltage.
DacStep2 = 0 indicates that the Ch2 CAPDAC value was changed after the last CDC conversion as part of the
AutoDac function. The bit value is updated after each finished CDC conversion on this channel.
OUT2 = 1 indicates that the Ch2 data (CIN2 capacitance) crossed the threshold, according to the selected
comparator mode of operation. The bit value is updated after each finished CDC conversion on this channel.
DacStep1 = 0 indicates that the Ch1 CAPDAC value was changed during the last conversion as part of the
AutoDac function. The bit value is updated after each finished CDC conversion on this channel.
OUT1 = 1 indicates that the Ch1 data (CIN1 capacitance) crossed the threshold, according to the selected
comparator mode of operation. The bit value is updated after each finished CDC conversion on this channel.
The C1/C2 = 0 indicates that the last finished CDC conversion was on Channel 1.
The C1/C2 = 1 indicates that the last finished CDC conversion was on Channel 2.
RDY2 = 0 indicates a finished CDC conversion on Ch2. The bit is reset back to 1 when the Ch2 data register is
read via the serial interface or after the part reset or power-up.
RDY1= 0 indicates a finished CDC conversion on Ch1. The bit is reset back to 1 when the Ch1 data register is
read via serial interface or after the part reset or power-up.
PwrDown
Bit 7
0
DacStep2
Bit 6
1
OUT2
Bit 5
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0
DacStep1
Bit 4
1
OUT1
Bit 3
0
C1/C2
Bit 2
0
DD
is below the power supply
RDY2
Bit 1
1
AD7150
RDY1
Bit 0
1