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| 型號(hào)： | AD7143ACPZ-1REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CONV CAP-TO-DGTL PROG 16LFCSP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 類型： | 電容數(shù)字轉(zhuǎn)換器 |
| 輸入類型： | 邏輯 |
| 輸出類型： | 邏輯 |
| 接口： | I²C |
| 電流 - 電源： | 1mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP-VQ |
| 包裝： | 帶卷 (TR) |
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AD7143
Rev. 0 | Page 17 of 56
NONCONTACT PROXIMITY DETECTION
The AD7143 internal signal processing continuously monitors
all capacitance sensors for noncontact proximity detection. This
feature provides the ability to detect when a user is approaching
a sensor, immediately disabling all internal calibration while the
AD7143 is automatically configured to detect a valid contact.
The proximity control register bits are described in Table 10.
FP_PROXIMITY_CNT register bits and LP_PROXIMITY
_CNT register bits control the length of the calibration disable
period after proximity is detected in full power and low power
modes. The calibration is disabled during this time and enabled
again at the end of this period if the user is no longer
28 show examples of how these registers are used to set the full
and low power mode calibration disable periods.
Calibration disable period in full power mode =
(FP_PROXIMITY_CNT × 16 × Time for one conversion
sequence in full power mode)
Calibration disable period in low power mode =
(LP_PROXIMITY_CNT × 4 × Time for one conversion
sequence in low power mode)
RECALIBRATION
In certain situations, the proximity flag can be set for a long
period, such as when a user hovers over a sensor for a long
time. The environmental calibration on the AD7143 is
suspended while the proximity is detected, but changes may
occur to the ambient capacitance level during the proximity
event. Even when the user has left the sensor untouched, the
proximity flag may still be set. This could occur if the user
interaction creates some moisture on the sensor causing the
new sensor value to be different from the expected value. In this
case, the AD7143 automatically forces an internal recalibration.
This ensures that the ambient values are recalibrated, regardless
of how long the user hovers over a sensor.
The AD7143 recalibrates automatically when the measured CDC value
exceeds the stored ambient value by an amount determined by
PROXIMITY_RECAL_LVL, for a set period know as the
recalibration timeout. In full power mode, the recalibration
timeout is controlled by FP_PROXIMITY_RECAL and in low
power mode, it is controlled by LP_PROXMTY_RECAL.
Recalibration timeout in full power mode =
FP_PROXIMITY_RECAL × Time for one conversion
sequence in full power mode
Recalibration timeout in low power mode =
LP_PROXIMITY_RECAL × Time taken for one conversion
sequence in low power mode
FP_PROXIMITY_RECAL and LP_PROXIMITY_RECAL
register bits to force a recalibration while operating in the full
and low power modes. These figures show the result of a user
approaching a sensor then leaving the sensor while the
proximity detection remains active after the user discontinues
contact with the sensor. This situation could occur if the user
interaction created some moisture on the sensor causing the
new sensor value to be different from the expected value. In this
case, the internal recalibration is applied to automatically
recalibrate the sensor. The forced recalibration event takes two
interrupt cycles; therefore, it should not be set again during this
interval.
PROXIMITY SENSITIVITY
The fast filter in Figure 31 is used to detect when some one is in
close proximity to the sensor. Two conditions set the internal
proximity detection signal using Comparator 1 and Comparator 2.
Comparator 1 detects when a user is approaching a sensor.
The PROXIMITY_DETECTION_RATE register controls the
sensitivity of Comparator 1. Consider, for example, if the
PROXIMITY_DETECTION_RATE is set to 4, the Proximity 1
signal is set when the absolute difference between WORD1 and
WORD3 exceeds four LSB codes.
Comparator 2 detects when a user hovers over a sensor or
approaches a sensor very slowly. The PROXIMITY_RECAL_LVL
register (Address 0x003) controls the sensitivity of Comparator 2.
For example, if PROXIMITY_RECAL_LVL is set to 75, the
Proximity 2 signal is set when the absolute difference between
the fast filter average value and the ambient value exceeds 75
LSB codes.
Table 10. Proximity Control Registers (See Figure 31)
Register
Length
Register Address
Description
FP_PROXIMITY_CNT
4 bits
0x002 [7:4]
Calibration disable time in full power mode
LP_PROXIMITY_CNT
4 bits
0x002 [11:8]
Calibration disable time in low power mode
FP_PROXIMITY_RECAL
8 bits
0x004 [9:0]
Full power mode proximity recalibration control
LP_PROXIMITY_RECAL
6 bits
0x004 [15:10]
Low power mode proximity recalibration control
PROXIMITY_RECAL_LVL
8 bits
0x003 [13:8]
Proximity recalibration level
PROXIMITY_DETECTION_RATE
6 bits
0x003 [7:0]
Proximity detection rate
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