參數(shù)資料
型號(hào)： X5649
元件分類(lèi)： CPU監(jiān)測(cè)
英文描述： RTC Module With CPU Supervisor
中文描述： 時(shí)鐘模塊CPU監(jiān)控
文件頁(yè)數(shù)： 3/22頁(yè)
文件大小： 120K
代理商： X5649
X5648/X5649
3
PRINCIPLES OF OPERATION
POWER ON RESET
Application of power to the X5648/X5649 activates a
Power On Reset Circuit. This circuit goes active at about
1V and pulls the RESET/RESET pin active. This signal
prevents the system microprocessor from starting to
operate with insufficient voltage or prior to stabilization of
the oscillator. When Vcc exceeds the device V
for 200ms (nominal) the circuit releases RESET/RESET,
allowing the processor to begin executing code.
TRIP
value
LOW VOLTAGE MONITORING
During operation, the X5648/X5649 monitors the V
level and asserts RESET/RESET if supply voltage falls
below a preset minimum V
signal prevents the microprocessor from operating in a
power fail or brownout condition. The RESET/RESET
signal remains active until the voltage drops below 1V. It
also remains active until Vcc returns and exceeds V
for 200ms.
CC
TRIP
. The RESET/RESET
TRIP
VCC THRESHOLD RESET PROCEDURE
The X5648/X5649 has a standard Vcc threshold (V
voltage. This value will not change over normal operating
and storage conditions. However, in applications where
the standard V
TRIP
is not exactly right, or for higher
precision in the V
TRIP
value, the X5648/X5649 threshold
may be adjusted.
TRIP
)
Setting the V
This procedure sets the V
For example, if the current V
V
TRIP
is 4.6V, this procedure directly makes the change. If
the new setting is lower than the current setting, then it is
necessary to reset the trip point before setting the new
value.
TRIP
Voltage
TRIP
to a higher voltage value.
TRIP
is 4.4V and the new
To set the new V
threshold to the Vcc pin and tie the CS pin and the WP pin
HIGH. RESET/RESET and SO pins are left unconnected.
Then apply the programming voltage Vp to both SCK and
SI and pulse CS LOW then HIGH. Remove Vp and the
sequence is complete.
TRIP
voltage, apply the desired V
TRIP
Figure 1. Set V
TRIP
Voltage
Resetting the V
This procedure sets the V
For example, if the current V
reset, the new V
procedure must be used to set the voltage to a lower
value.
TRIP
Voltage
TRIP
TRIP
to a “native” voltage level.
is 4.4V and the V
is something less than 1.7V. This
TRIP
is
TRIP
To reset the V
and 5.5V to the Vcc pin. Tie the CS pin, the WP pin, and
the SCK pin HIGH. RESET/RESET and SO pins are left
unconnected. Then apply the programming voltage Vp to
the SI pin ONLY and pulse CS LOW then HIGH. Remove
Vp and the sequence is complete.
TRIP
voltage, apply a voltage between 2.7
Figure 2. Reset V
TRIP
Voltage
SCK
SI
Vp
Vp
CS
SCK
SI
Vcc
Vp
CS
相關(guān)PDF資料
PDF描述
X60003B-50 Precision 5.0V SOT-23 FGA Voltage Reference(5.0V SOT-23 FGA 精密電壓基準(zhǔn))
X60003C-50 Precision 5.0V SOT-23 FGA Voltage Reference(5.0V SOT-23 FGA 精密電壓基準(zhǔn))
X60003D-50 Precision 5.0V SOT-23 FGA Voltage Reference(5.0V SOT-23 FGA 精密電壓基準(zhǔn))
X60003C Precision 5.0V SOT-23 FGA Voltage Reference(精密5.0V SOT-23 FGA電壓基準(zhǔn))
X60003D Precision 5.0V SOT-23 FGA Voltage Reference(精密5.0V SOT-23 FGA電壓基準(zhǔn))
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