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| 型號： | AD7143ACPZ-1REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 19/57頁 |
| 文件大小： | 0K |
| 描述： | IC CONV CAP-TO-DGTL PROG 16LFCSP |
| 標準包裝： | 5,000 |
| 類型： | 電容數(shù)字轉換器 |
| 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 |
| 供應商設備封裝： | 16-LFCSP-VQ |
| 包裝： | 帶卷 (TR) |
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AD7143
Rev. 0 | Page 25 of 56
ADAPTIVE THRESHOLD AND SENSITIVITY
The AD7143 provides an on-chip self-learning adaptive
threshold and sensitivity algorithm. This algorithm continu-
ously monitors the output levels of each sensor and automatically
rescales the threshold levels proportionally to the sensor area
covered by the user. As a result, the AD7143 maintains optimal
threshold and sensitivity levels for all types of users regardless
of their finger sizes.
The threshold level is always referenced from the ambient level
and is defined as the CDC converter output level that must be
exceeded for a valid sensor contact. The sensitivity level is
defined as how sensitive the sensor is before a valid contact is
registered.
Figure 36 provides an example of how the adaptive threshold and
sensitivity algorithm works. The positive and negative sensor
threshold levels are calculated as a percentage of the
STAGE_OFFSET_HIGH and STAGE_OFFSET_LOW values
based on the threshold sensitivity settings and the ambient value.
On configuration, initial estimates are supplied for both
STAGE_OFFSET_HIGH and STAGE_OFFSET_LOW after
which the calibration engine automatically adjusts the
STAGE_HIGH_THRESHOLD and STAGE_LOW_THRESHOLD
values for sensor response.
Reference A in Figure 36 shows an under sensitive threshold
level for a small finger user, demonstrating the disadvantages of
a fixed threshold level. By enabling the adaptive threshold and
sensitivity algorithm, the positive and negative threshold levels
are determined by the POS_THRESHOLD_SENSITIVITY and
NEG_THRESHOLD_SENSITIVITY register values and the
most recent average maximum sensor output value. These
registers can be used to select 16 different positive and negative
sensitivity levels ranging between 25% and 95.32% of the most
recent average maximum output level referenced from the
ambient value. The smaller the sensitivity percentage setting,
the easier it is to trigger a sensor activation. Reference B shows
that the positive adaptive threshold level is set at almost mid-
sensitivity with a 62.51% threshold level by setting
POS_THRESHOLD_SENSITIVITY = 1000. Figure 36 also
provides a similar example for the negative threshold level with
NEG_THRESHOLD_SENSITIVITY = 0001.
AMBIENT LEVEL
CDC
O
UT
P
UT
CO
DE
S
AVERAGE MAX VALUE
STAGE_OFFSET_HIGH
25%
95.32%
62.51% = POS
ADAPTIVE
THRESHOLD LEVEL
25%
62.51% = POS ADAPTIVE
THRESHOLD LEVEL
95.32%
NEG ADAPTIVE THRESHOLD LEVEL = 39.08%
25%
95.32%
25%
95.32%
SENSOR CONTACTED
BY SMALL FINGER
AVERAGE MAX VALUE
STAGE_OFFSET_LOW
NEG ADAPTIVE THRESHOLD LEVEL = 39.08%
SENSOR CONTACTED
BY LARGE FINGER
STAGE_OFFSET_HIGH
IS UPDATED
STAGE_OFFSET_HIGH
IS UPDATED HERE
STAGE_OFFSET_LOW
IS UPDATED HERE
STAGE_OFFSET_LOW
IS UPDATED HERE
A
B
0
64
72
-03
3
Figure 36. Threshold Sensitivity Example with POS_THRESHOLD_SENSITIVITY = 1000 and NEG_THRESHOLD_SENSITIVITY = 0011
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