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参数资料
| 型号： | RS5C321B-E1 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封装： | 0.65 MM PITCH, SSOP-8 |
| 文件页数： | 17/33页 |
| 文件大小： | 286K |
| 代理商： | RS5C321B-E1 |
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RS5C321A/B
20
8. Typical Power Supply Circuit
1) Connect the capacitance of the oscillation circuit to the Vss pin.
2) Mount the high-and low-frequency by-pass capacitors in paral-
lel and very close to the RS5C321.
3) Connect the pull-up resistor of the 32KOUT pin to two differ-
ent positions depending on whether the resistor is in use dur-
ing battery back-up.
When not in use during battery back-up
...........Position A in the left figure
When in use during battery back-up
...........Position B in the left figure
4) Timing of power-on, power-off and CE pin refer to following figure.
5) When a diode are in use in place of the components surround-
ed by dotted lines, note that applying voltage to any input pins
should be less than the rating of VDD +0.3V by using of schot-
tky diode.
OSCIN
OSCOUT
VDD
RS5C321
VSS
B
A
System
supply
voltage
32KOUT
C
0V
VDD
CE
D
0.2VDD
MIN. 0
s
MIN. 0
s
MIN. 0
s
C, D, E: Minimum operating voltage for CPU
0.2VDD
Battery voltage
System supply voltage
E
9. Oscillation Frequency Adjustment
9.1 Oscillation Frequency Measurement
1) After initial power-on (XSTP=1), 32KOUT pin outputs
32.768kHz clock pulse, which is measured with a fre-
quency counter.
2) Ensure that the frequency counter has more than six
digits (on the order of 1 ppm).
3) Place the CG between the OSCIN pin and the VSS lev-
el and pull up the 32KOUT pin output to the VDD.
32KOUT
OSCOUT
OSCIN
VDD
CE
VSS
32.768kHz
+5V or +3V
Frequency
counter
CG
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RS5C338A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION |
| RS5C338A-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION |
| RS5C348A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:4-WIRE SERIAL INTERFACE |
| RS5C348A-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:Real-Time Clock |
| RS5C348B | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:4-WIRE SERIAL INTERFACE |
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