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參數(shù)資料
| 型號： | X5169 |
| 元件分類： | CPU監(jiān)測 |
| 英文描述： | RTC Module With CPU Supervisor |
| 中文描述： | 時鐘模塊CPU監(jiān)控 |
| 文件頁數(shù)： | 3/22頁 |
| 文件大?。?/td> | 112K |
| 代理商： | X5169 |
X5168/X5169
3
PRINCIPLES OF OPERATION
POWER ON RESET
Application of power to the X5168/X5169 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 oper-
ate with insufficient voltage or prior to stabilization of the
oscillator. When Vcc exceeds the device V
200ms (nominal) the circuit releases RESET/RESET,
allowing the processor to begin executing code.
TRIP
value for
LOW VOLTAGE MONITORING
During operation, the X5168/X5169 monitors the V
level and asserts RESET/RESET if supply voltage falls
below a preset minimum V
TRIP
nal prevents the microprocessor from operating in a
power fail or brownout condition. The RESET/RESET sig-
nal remains active until the voltage drops below 1V. It also
remains active until Vcc returns and exceeds V
200ms.
CC
. The RESET/RESET sig-
TRIP
for
VCC THRESHOLD RESET PROCEDURE
The X5168/X5169 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 preci-
sion in the V
TRIP
value, the X5168/X5169 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
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