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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： | 30/53页 |
| 文件大小： | 343K |
| 代理商： | R2051K02 |
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R2051 Series
12345
Rev.1.04
- 36 -
n Power-on Reset, Oscillation Halt Sensing, and Supply Voltage Monitoring
l
PON, /XST, and VDET
The power-on reset circuit is configured to reset control register1, 2, and clock adjustment register when VDD
power up from 0v. The oscillation halt sensing circuit is configured to record a halt on oscillation by 32.768-kHz
clock pulses.
The supply voltage monitoring circuit is configured to record a drop in supply voltage below a
threshold voltage of 2.1 or 1.35v.
Each function has a monitor bit. I.e. the PON bit is for the power-on reset circuit, and /XST bit is for the oscillation
halt sensing circuit, and VDET is for the supply voltage monitoring circuit. PON and VDET bits are activated to “H”.
However, /XST bit is activated to “L”. The PON and VDET accept only the writing of 0, but /XST accepts the writing
of 0 and 1. The PON bit is set to 1, when VDD power-up from 0V, but VDET is set to 0, and /XST is indefinite.
The functions of these three monitor bits are shown in the table below.
PON
/XST
VDET
Function
Monitoring for the power-on
reset function
Monitoring for the
oscillation halt sensing
function
a drop in supply voltage
below a threshold voltage
of 2.1 or 1.35v
Address
D4 in Address Fh
D5 in Address Fh
D6 in Address Fh
Activated
High
Low
High
When VDD power
up from 0v
1
indefinite
0
accept the writing
0 only
Both 0 and 1
0 only
The relationship between the PON, /XST, and VDET is shown in the table below.
PON
/XST
VDET
Conditions
of
supply
voltage
and
oscillation
Condition of oscillator, and back-up
status
0
Halt on oscillation, but no drop in VDD
supply voltage below threshold voltage
Halt
on
oscillation
cause
of
condensation etc.
0
1
Halt on oscillation and drop in VDD
supply
voltage
below
threshold
voltage, but no drop to 0V
Halt on oscillation cause of drop in
back-up battery voltage
0
1
0
No drop in VDD supply voltage below
threshold
voltage
and
no
halt
in
oscillation
Normal condition
0
1
Drop in
VDD supply voltage below
threshold voltage and no halt on
oscillation
No halt on oscillation, but drop in
back-up battery voltage
1
*
Drop in supply voltage to 0v
Power-up from 0v,
32768Hz Oscillation
Power-on reset flag
(PON)
Oscillation halt
sensing flag (/XST)
Threshold voltage (2.1V or 1.35V)
VDD
VDD supply voltage
monitor flag (VDET)
Internal initialization
period (1 to 2 sec.)
VDET
←0
/XST
←1
PON
←0
VDET
←0
/XST
←1
PON
←1
VDET
←0
/XST
←1
PON
←0
Internal initialization
period (1 to 2 sec.)
相关PDF资料 |
PDF描述 |
|---|---|
| R2051K01 | 0 TIMER(S), REAL TIME CLOCK, QCC12 |
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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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