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参数资料
| 型号： | R2051K02 |
| 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, QCC12 |
| 封装： | 2 X 2 MM, 0.85 MM PITCH, ULTRA-COMPACT, FFP, 12 PIN |
| 文件页数： | 38/53页 |
| 文件大小： | 343K |
| 代理商： | R2051K02 |
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R2051 Series
12345
Rev.1.04
- 43 -
n Typical Applications
l
Typical Power Circuit Configurations
VDD
VSB
VCC
VSS
0.1
F
CPU Power
Supply
The case of back-up by
primary battery
CR2025
etc.
VSB
VDD
VCC
VSS
0.1
F
CPU power
supply
ML614
etc.
The case of back-up by
capacitor or secondary battery
(Charging voltage is equal to CPU
power supply voltage)
VSB
VDD
VCC
VSS
0.1
F
CPU power
supply
(3V)
5V
Double layer
capacitor
etc.
The case of back-up by
capacitor or secondary battery
(Charging voltage is not equal to
CPU power supply voltage)
VDD pin cannot be connect to any additional heavy load components such as SRAM.
And VDD pin must be
connected C2, and C2 should be over 0.1
F.
VDD
CPU power supply
VCC
VSB
C3
VOLTAGE
DETECTOR
SW1
SW2
C2
R1
CPU
Vbat
-VDET1
Rcpu
R2051 Series
When secondary battery or double layer capacitor connects to VDD pin, after CPU power supply turning off,
secondray battery discharges through the root above figure. If R1 is much smaller than CPU impedance (Rcpu),
VCC voltage keeps higher than -VDET1, and SW1 keeps on. Therefore R1 must be specified by following formula.
R1 > Rcpu x (Vbat - (-VDET1)) / (-VDET1)
R1 is specified by back-up battery or double layer capacitor, too.
Please check the data sheet for back-up
devices.
l
Connection of CIN pin
Please connect capacitor over 0.1
F between CIN and VSS pin.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| R2051K02-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S01-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S02-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S03-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051T01-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
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