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參數(shù)資料
| 型號： | RX-4045NBAA |
| 元件分類： | XO, clock |
| 英文描述： | REAL TIME CLOCK, PDSO22 |
| 封裝： | ROHS COMPLIANT, SON-22 |
| 文件頁數(shù)： | 19/37頁 |
| 文件大?。?/td> | 554K |
| 代理商： | RX-4045NBAA |
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RX - 4045 SA / NB
Page - 23
MQ442-01
8.8.2. Oscillation stop detection
This function detects when internal oscillation has stopped. When an oscillation stop is detected, the /XST bit value
becomes "0".
If a "1" has already been written to the /XST bit, the /XST bit is cleared to zero when stopping of internal oscillation is
detected, so this function can be used to determine whether or not an oscillation stop has occurred previously, such
as after recovery from a backup.
1) / XST bit
This bit indicates the oscillation stop detection function's detection results.
/ XST
Data
Description
0
Setting prohibited (do not set this bit value, even though it has no
effect)
Write
1
Sets the oscillation stop detection function as use-enabled and
sets up for next detection operation
0
Oscillation stop was detected
(result is that bit value is held until a "1" is written)
Read
1
Oscillation stop was not detected
2) Caution points
To prevent detection errors during operation of the oscillation stop detection
function, be sure to prevent stops due to VDD power flicker and prevent
application of voltage exceeding the maximum rated voltage to any pin.
In particular, fluctuation in the supply voltage may occur as shown in the figure
at right, such as when a back-up battery is used. If this occurs, internal data
may be lost even when the / XST bit value has not changed from "1" to "0" so
be sure to avoid any input that contains large amounts of chattering.
Example of voltage fluctuation that
makes oscillation stop hard to detect
VDD
8.8.3. Voltage drop detection
This function detects when a voltage drop occurs. Detection of a voltage drop changes the VDET bit value to "1".
The threshold voltage value for detection can be set via the VDSL bit as 2.1 V or 1.3 V.
1) VDSL bit
This bit is used to set the power drop detection function's threshold voltage value.
VDSL
Data
Description
0
Sets 2.1 V as the power drop detection function's threshold
voltage value
Default
Write / Read
1
Sets 1.3 V as the power drop detection function's threshold
voltage value
2) VDET bit
This bit indicates the power drop detection function's detection results. VDET = "1" once a power voltage drop
has occurred. This detection operation is then stopped and the bit value (1) is held.
VDET
Data
Description
0
Clears the VDET bit to zero, restarts the power drop detection
operation and sets up for next power drop detection operation
Default
Write
1
Setting prohibited (do not set this bit value, even though it has no
effect)
0
Power drop was not detected
Default
Read
1
Power drop was detected
(result is that bit value is held until cleared to zero)
3) Caution points
To reduce current
consumption while monitoring
the supply voltage, the supply
voltage monitor circuit
samples for only 7.8 ms
during each second, as
shown at right.
Sampling is stopped once the
VDET bit = "1". (Clear the
VDET bit to zero to resume
operation of the detection
function.)
VDET
(D6 in address Fh)
PON
VDD
2.1 V or 1.3 V
1 s
Write 0 to
VDET
7.8 ms
Sampling for supply
voltage monitoring
Internal initialization
period (1 to 2 s)
Write 0 to PON
& VDET
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| RX-4045SA | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-wire serial interface high-stability RTC module |
| RX-4045SA,(AA) | 制造商:Epson Toyocom 功能描述:Serial Interface RTC SOP 14pin |
| RX-4045SAAA | 制造商:Epson Toyocom Corporation 功能描述:Cut Tape 制造商:Epson Toyocom Corporation 功能描述:RTC HI STABILITY SERIAL SMD SOP14 制造商:Epson Toyocom Corporation 功能描述:RTC HI STABILITY SERIAL, SMD, SOP14 制造商:Epson Toyocom Corporation 功能描述:RTC HI STABILITY SERIAL, SMD, SOP14; Date Format:YYYY:MM:DD:Hr:Min:Secs; Clock Format:12Hr / 24Hr; Clock IC Type:RTC; Supply Voltage Min:1.7V; Supply Voltage Max:5.5V; Digital IC Case Style:SOP; No. of Pins:14; Interface Type:Serial;;RoHS Compliant: Yes |
| RX-409 | 功能描述:烙鐵 SOLDERING TIP RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included |
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