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參數(shù)資料
| 型號： | FAB2210UCX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 13/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SUBSYSTEM HDPH AMP G 20-WLCSP |
| 標準包裝： | 1 |
| 類型： | D 類；G 類 |
| 輸出類型： | 1-通道（單聲道），帶立體聲耳機 |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 3.3W x 1 @ 8 歐姆; 29mW x 2 @ 32 歐姆 |
| 電源電壓： | 2.8 V ~ 5.25 V |
| 特點： | 消除爆音，差分輸入，I²C，靜音，短路和熱保護，關機，音量控制 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 20-WLCSP |
| 封裝/外殼： | 20-UFBGA，WLCSP |
| 包裝： | 標準包裝 |
| 其它名稱： | FAB2210UCXFSDKR |
29
9614A–AT42–08/10
AT42QT2161
6.13
Address 15 – 16: Neg/Pos Drift Compensation
Signals can drift because of changes in Cx and Cs over time and temperature. It is crucial that
such drift be compensated, else false detections and sensitivity shifts can occur.
Drift compensation (see Figure 6-1) is performed by making the reference level track the raw
signal at a slow rate, but only while there is no detection in effect. The rate of adjustment must
be performed slowly, otherwise legitimate detections could be ignored. The parameters can be
configured in increments of 0.16s.
Figure 6-1.
Thresholds and Drift Compensation
The device drift compensates using a slew-rate limited change to the reference level; the
threshold and hysteresis values are slaved to this reference.
When a finger is sensed, the signal falls since the human body acts to absorb charge from the
cross-coupling between X and Y lines. An isolated, untouched foreign object (a coin, or a water
film) will cause the signal to rise very slightly due to an enhancement of coupling. This is contrary
to the way most capacitive sensors operate.
Once a finger is sensed, the drift compensation mechanism ceases since the signal is
legitimately detecting an object. Drift compensation only works when the signal in question has
not crossed the negative threshold level.
The drift compensation mechanism can be asymmetric; the drift-compensation can be made to
occur in one direction faster than it does in the other simply by changing the NDRIFT and
PDRIFT Setup parameters. This is a global configuration.
Specifically, drift compensation should be set to compensate faster for increasing signals than
for decreasing signals. Decreasing signals should not be compensated quickly, since an
approaching finger could be compensated for partially or entirely before even touching the
touchpad (NDRIFT).
Table 6-13.
Neg/Pos Drift Compensation
Address
b7b6b5
b4b3b2b1
b0
15
0
NDRIFT
16
0
PDRIFT
Threshold
Signal
Hysteresis
Reference
Output
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