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參數資料
| 型號： | X5045PI-4.5A |
| 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： | 3/20頁 |
| 文件大?。?/td> | 108K |
| 代理商： | X5045PI-4.5A |
X5043/X5045
Characteristics subject to change without notice.
3 of 20
REV 1.1.2 5/29/01
www.xicor.com
PRINCIPLES OF OPERATION
Power On Reset
Application of power to the X5043/X5045 activates a
Power On Reset Circuit. This circuit pulls the RESET/
RESET pin active. RESET/RESET prevents the sys-
tem microprocessor from starting to operate with insuf-
ficient voltage or prior to stabilization of the oscillator.
When V
CC
exceeds the device V
(nominal) the circuit releases RESET/RESET, allowing
the processor to begin executing code.
TRIP
value for 200ms
Low Voltage Monitoring
During operation, the X5043/X5045 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 V
V
TRIP
for 200ms.
CC
TRIP
. The RESET/RESET
CC
returns and exceeds
Watchdog Timer
The Watchdog Timer circuit monitors the microproces-
sor activity by monitoring the WDI input. The micropro-
cessor must toggle the CS/WDI pin periodically to
prevent an active RESET/RESET signal. The CS/WDI
pin must be toggled from HIGH to LOW prior to the
expiration of the watchdog time out period. The state of
two nonvolatile control bits in the Status Register
determines the watchdog timer period. The micropro-
cessor can change these watchdog bits. With no
microprocessor action, the watchdog timer control bits
remain unchanged, even during total power failure.
V
The X5043/X5045 is shipped with a standard V
threshold (V
TRIP
) voltage. This value will not change
over normal operating and storage conditions. How-
ever, in applications where the standard V
exactly right, or if higher precision is needed in the
V
TRIP
value, the X5043/X5045 threshold may be
adjusted. The procedure is described below, and uses
the application of a high voltage control signal.
CC
Threshold Reset Procedure
CC
TRIP
is not
Setting the V
This procedure is used to set the V
age value. For example, if the current V
and the new V
TRIP
is 4.6V, this procedure will directly
make the change. If the new setting is to be 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 volt-
TRIP
is 4.4V
To set the new V
threshold voltage to the V
the programming voltage V
mand, followed by a write of Data 00h to address 01h.
CS going HIGH on the write operation initiates the
V
TRIP
programming sequence. Bring WP LOW to com-
plete the operation.
TRIP
voltage, apply the desired V
CC
pin and tie the WP pin to
P
. Then send a WREN com-
TRIP
Note:
This operation also writes 00h to array address 01h.
Figure 1. Set V
TRIP
Level Sequence (V
CC
= desired V
TRIP
value.)
0 1 2 3 4 5 6 7
SCK
SI
CS
06h
WREN
0 1 2 3 4 5 6 7 8 9 10
12 1314 15
8 Bits
01h
Address
02h
Write
WP
V
PE
= 15-18V
00h
Data
11
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