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參數(shù)資料
| 型號： | R2025S |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | High precision I2C-Bus Real-Time Clock Module |
| 中文描述： | REAL TIME CLOCK, PDSO14 |
| 封裝： | 10.10 X 7.40 MM, 3.10 MM HEIGHT, SOP-14 |
| 文件頁數(shù)： | 31/47頁 |
| 文件大?。?/td> | 524K |
| 代理商： | R2025S |
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R2025S/D
31
Power-on Reset, Oscillation Halt Sensing, and Supply Voltage
Monitoring
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 1.3v.
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
Function
Monitoring for the
power-on reset function
oscillation halt sensing
function
Address
D4 in Address Fh
D5 in Address Fh
Activated
High
Low
When VDD
power up from
0v
accept the
writing
The relationship between the PON, /XST, and VDET is shown in the table below.
PON
/XST
VDET
Conditions of supply voltage and
oscillation
0
0
0
Halt on oscillation, but no drop in
VDD supply voltage below threshold
voltage
0
0
1
Halt on oscillation and drop in VDD
supply voltage below threshold
voltage, but no drop to 0V
0
1
0
No drop in VDD supply voltage
below threshold voltage and no halt
in oscillation
0
1
1
Drop in VDD supply voltage below
threshold voltage and no halt on
oscillation
1
*
*
Drop in supply voltage to 0v
/XST
VDET
Monitoring for the
a drop in supply voltage
below a threshold
voltage of 2.1 or 1.3v
D6 in Address Fh
High
0
1
indefinite
0 only
Both 0 and 1
0 only
Condition of oscillator, and
back-up status
Halt on oscillation cause of
condensation etc.
Halt on oscillation cause of drop in
back-up battery voltage
Normal condition
No halt on oscillation, but drop in
back-up battery voltage
Power-up from 0v,
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