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參數(shù)資料
| 型號(hào)： | FAB2210UCX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 18/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SUBSYSTEM HDPH AMP G 20-WLCSP |
| 標(biāo)準(zhǔn)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(jī) |
| 在某負(fù)載時(shí)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(diǎn)： | 消除爆音，差分輸入，I²C，靜音，短路和熱保護(hù)，關(guān)機(jī)，音量控制 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 20-WLCSP |
| 封裝/外殼： | 20-UFBGA，WLCSP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | FAB2210UCXFSDKR |
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33
9614A–AT42–08/10
AT42QT2161
6.19
Address 22 – 37: Key Control
AKS GROUP: these bits configure which AKS group a key is within (0 - AKS disabled, 1, 2 or 3).
Keys in the same group cannot both be in detect at the same time, unless they both form part of
the slider (see Section 3.9.2 on page 13).
Default: 0 (AKS disabled)
6.20
Address 38 – 53: Negative Threshold
The negative threshold value is established relative to a key’s signal reference value. The
threshold is used to determine key touch when crossed by a negative-going signal swing after
having been filtered by the detection integrator. Larger absolute values of threshold desensitize
keys since the signal must travel farther in order to cross the threshold level.
Conversely, lower thresholds make keys more sensitive.
As Cx and Cs drift, the reference point drift-compensates for these changes at a user-settable
rate; the threshold level is recomputed whenever the reference point moves, and thus it also is
drift compensated.
The amount of NTHR required depends on the amount of signal swing that occurs when a key is
touched. Thicker panels or smaller key geometries reduce “key gain”, i.e. signal swing from
touch, thus requiring smaller NTHR values to detect touch.
Negative hysteresis: this is fixed at two less than the negative threshold value and cannot be
altered. It is implemented to stop keys from dithering in and out of detect.
NTHR Typical values:7 to 12
NTHR Default value: 10 (10 counts of threshold)
6.21
Address 54 – 69: Burst Length
The QT2161 uses a fixed number of pulses which are executed in burst mode. This number is
set in groups of four. Therefore, the value send to the QT2161 is multiplied by four to get the
actual number of burst pulses.
Table 6-20.
Key Control
Address
b7b6b5
b4b3b2b1
b0
22 – 37
000
AKS GROUP
Table 6-21.
Negative Threshold
Address
b7b6b5
b4b3b2b1
b0
38 – 53
THRESHOLD
Table 6-22.
Burst Length
Address
b7b6b5
b4b3b2b1
b0
54 – 69
BURST LENGTH
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