AD7147A Analog Devices, AD7147A Datasheet - Page 20

• Manufacturer Part Number: AD7147A
• Manufacturer: Analog Devices

Specifications of AD7147A

• Resolution (bits): 16bit
• # Chan: 13
• Sample Rate: 111SPS
• Interface: I²C/Ser 2-Wire,Ser,SPI
• Analog Input Type: Capacitive
• Ain Range: ± 8 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

AD7147A
CDC CONVERSION
CDC CONVERSION
RECALIBRATION
RECALIBRATION
CALIBRATION
CALIBRATION
DETECTION
DETECTION
(INTERNAL)
(INTERNAL)
(INTERNAL)
(INTERNAL)
(INTERNAL)
(INTERNAL)
SEQUENCE
SEQUENCE
PROXIMITY
PROXIMITY
(INTERNAL)
(INTERNAL)
COUNTER
Figure 32. Example of Low Power Mode Proximity Detection with Forced Recalibration (LP_PROXIMITY_CNT = 4 and LP_PROXIMITY_RECAL = 40)
Figure 31. Example of Full Power Mode Proximity Detection with Forced Recalibration (FP_PROXIMITY_CNT = 1 and FP_PROXIMITY_RECAL = 40)
NOTES
1. SEQUENCE CONVERSION TIME
2.
3.
4.
NOTES
1. SEQUENCE CONVERSION TIME
2.
3.
4.
t
t
t
t
t
t
CALDIS
RECAL_TIMEOUT
RECAL
CALDIS
RECAL_TIMEOUT
RECAL
USER APPROACHES
USER APPROACHES
= 2 ×
= 2 ×
=
=
SENSOR
SENSOR
t
t
CONV_FP
CONV_LP
t
t
CONV_FP
CONV_LP
=
=
t
t
CONV_FP
CONV_LP
× FP_PROXIMITY_CNT × 16.
× LP_PROXIMITY_CNT × 4.
CALIBRATION DISABLED
.
CALIBRATION DISABLED
.
SENSOR AREA
SENSOR AREA
USER LEAVES
USER LEAVES
× FP_PROXIMITY_RECAL.
× LP_PROXIMITY_RECAL.
t
t
CONV_FP
CONV_LP
16
16
t
t
CALDIS
CALDIS
(SEE TABLE 10).
=
t
CONV_FP
Rev. B | Page 20 of 68
+ LP_CONV_DELAY.
30
30
MEASURED CDC VALUE > STORED AMBIENT
MEASURED CDC VALUE > STORED AMBIENT
BY PROXIMITY_RECAL _LVL
BY PROXIMITY_RECAL _LVL
RECALIBRATION TIMEOUT
RECALIBRATION TIMEOUT
t
t
RECAL_TIMEOUT
RECAL_TIMEOUT
t
t
RECAL
RECAL
70
70
CALIBRATION ENABLED
CALIBRATION ENABLED
t
t
CONV_FP
CONV_LP