AD7143ACPZ Analog Devices Inc, AD7143ACPZ Datasheet - Page 18

• Manufacturer Part Number: AD7143ACPZ
• Description: IC, CDC, 16BIT, SMD, LFCSP-16, 7143
• Manufacturer: Analog Devices Inc

Specifications of AD7143ACPZ

• Supply Voltage Range: 2.6V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LFCSP
• No. Of Pins: 16
• Svhc: No SVHC (18-Jun-2010)
• Package / Case: LFCSP
• Base Number: 7143
• Ic Function: Programmable Controller For Capacitance Touch Sensors
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD7143
Note that in Figure 29, the sequence conversion time, t
CDC CONVERSION
RECALIBRATION
CALIBRATION
DETECTION
(INTERNAL)
(INTERNAL)
(INTERNAL)
SEQUENCE
PROXIMITY
(INTERNAL)
COUNTER
Figure 29. Full Power Mode Proximity Detection with Forced Recalibration Example with FP_PROXIMIT_CNT = 1 and FP_PROXIMITY_RECAL = 40
CDC CONVERSION
CDC CONVERSION
CALIBRATION
CALIBRATION
DETECTION
DETECTION
(INTERNAL)
(INTERNAL)
(INTERNAL)
(INTERNAL)
(INTERNAL)
(INTERNAL)
SEQUENCE
SEQUENCE
PROXIMITY
PROXIMITY
NOTES
1.
2.
3.
t
t
t
CALDIS
RECAL_TIMEOUT
RECAL
USER APPROACHES
SENSOR HERE
= 2 ×
=
Figure 28. Low Power Mode Proximity Detection with LP_PROXIMITY_CNT = 4 and LP_CONV_DELAY = 0
NOTES
1. SEQUENCE CONVERSION TIME
2. PROXIMITY IS SET WHEN USER APPROACHES THE SENSOR AT WHICH TIME THE INTERNAL CALIBRATION IS DISABLED.
3.
t
CONV_FP
t
CALDIS
t
CONV_FP
USER APPROACHES
USER APPROACHES
=
SENSOR HERE
SENSOR HERE
t
USER LEAVES SENSOR
Figure 27. Full Power Mode Proximity Detection Example with FP_PROXIMITY_CNT = 1
CONV_FP
× FP_PROXIMITY_CNT × 16.
= (
CALIBRATION DISABLED
.
t
CONV_LP
AREA HERE
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
× FP_PROXIMITY_RECAL.
× LP_PROXIMITY_CNT × 4).
16
USER LEAVES SENSOR
USER LEAVES SENSOR
t
CALDIS
AREA HERE
AREA HERE
t
CONV_LP
CONV_FP,
CALIBRATION DISABLED
CALIBRATION DISABLED
=
Rev. 0 | Page 18 of 56
t
CONV_FP
is determined from Table 8.
30
MEASURED CDC VALUE > STORED AMBIENT
+ LP_CONV_DELAY.
BY PROXIMITY_RECAL _LVL
RECALIBRATION TIMEOUT
t
t
CALDIS
CALDIS
17 18 19 20 21 22 23 24
17 18 19 20 21 22 23 24
t
RECAL_TIMEOUT
CALIBRATION ENABLED
CALIBRATION ENABLED
t
RECAL
70
CALIBRATION ENABLED
t
t
CONV_FP
CONV_LP
t
CONV_FP