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參數資料
| 型號： | W93902 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 尋呼電路 |
| 英文描述： | POCSAG Decoder For Pagers(尋呼機的POCSAG 解碼器) |
| 中文描述： | TELECOM, PAGING DECODER, PDSO24 |
| 封裝： | SSOP-24 |
| 文件頁數： | 20/22頁 |
| 文件大小： | 244K |
| 代理商： | W93902 |
W93902
- 20 -
FOUT2 will output frequency when EFOUT2 is high:
FUNCTION
FOUT2 output
OPTION
SF21
0
0
1
1
SF20
0
1
0
1
16 KHz(32768Hz crystal)/19 KHz (76800Hz)
64 Hz
16 Hz
1/60 Hz
Table 28
Note: When FOUT1 and FOUT2 are assigned the same frequency, they will have a different phase.
Buzzer output operation (FBUZ1 and FBUZ2 normally pulled high):
FUNCTION
FALM output
2 KHz
4 KHz
3.2 KHz
2.7 KHz
PIN
FBUZ2
low
low
high
high
FBUZ1
low
high
low
high
Table 29
Notes:
1.The frequency of FLAM output is controled by the voltage of FBUZ1 and FBUZ2 pin.
2. FBUZ2 is active only when EBTL = 1. If use the battery low detection function (EBTL = 0), the FBUZ2 is internally pull high and
FALM can only output 2.7 KHz or 3.2 KHz.
Battery low detection circuit enable options:
FUNCTION
FBUZ2/BTLIN
BTLIN
FBUZ2
OPTION
EBTL
0
1
Table 30
The battery low detect function samples the BTLIN pin (when EBTL = 0) each time BS1 is active. If
the level of this pin is detected to be high four times in a row, then a high signal will be output through
the BTLDT pin, until the BTLIN pin is detected to be low four times in a row.
Buzzer, LED, and Timer Reference Clock Output
The W93902 provides an AI pin to enable the FALM pin output and frequency selection through the
FBUZ1 and FBUZ2 pins, as shown in Table 29. When AI is low, FALM is at high impedance. When AI
is high, FALM outputs the specified frequency with an N-channel open drain MOS architecture. FALM
should be connected to an external pull-up resistor in normal usage, so that the power consumption
can be controlled when the buzzer is active.
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