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参数资料
| 型号： | M41ST87YMX6TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOX-28 |
| 文件页数： | 29/48页 |
| 文件大小： | 457K |
| 代理商： | M41ST87YMX6TR |
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M41ST87Y, M41ST87W
Clock operation
Table 9.
Square wave output frequency
3.6
Full-time 32 kHz square wave output
The M41ST87Y/W offers the user a special 32kHz square wave function which defaults to
output on the F32k pin (pin 21) as long as VCC ≥ VSO, and the oscillator is running (ST bit =
'0'). This function is available within one second (typ) of initial power-up and can only be
disabled by setting the 32 kE bit to '0' or the ST bit to '1.' If not used, the F32k pin should be
disconnected and allowed to float.
Note:
The F32k pin is an open drain which requires an external pull-up resistor.
3.7
Power-on reset
The M41ST87Y/W continuously monitors VCC. When VCC falls to the power fail detect trip
point, the RST pulls low (open drain) and remains low on power-up for trec after VCC passes
VPFD(max). The RST pin is an open drain output and an appropriate pull-up resistor should
be chosen to control rise time.
Note:
A power-on reset will result in resetting the following control bits to '0': OFIE, AFE, ABE,
SQWE, FT, WDS, BMB0-BMB4, RB0, RB1, TIE1, and TIE2 (see Table 13 on page 39).
3.8
Reset inputs (RSTIN1 & RSTIN2)
The M41ST87Y/W provides two independent inputs which can generate an output reset.
The function of these resets is identical to a reset generated by a power cycle. Table 10 and
Square wave bits
Square wave
RS3
RS2
RS1
RS0
Frequency
Units
0000
None
–
0001
32.768
kHz
0010
8.192
kHz
0011
4.096
kHz
0100
2.048
kHz
0101
1.024
kHz
0110
512
Hz
0111
256
Hz
1000
128
Hz
1001
64
Hz
1010
32
Hz
1011
16
Hz
11008
Hz
11014
Hz
11102
Hz
11111
Hz
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