參數(shù)資料
型號(hào)： X5165P
廠商： INTERSIL CORP
元件分類： 電源管理
英文描述： RTC Module With CPU Supervisor
中文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 3/21頁(yè)
文件大?。?/td> 117K
代理商： X5165P
X5163/X5165 – Preliminary Information
Characteristics subject to change without notice.
3 of 21
REV 1.1 3/5/01
www.xicor.com
PRINCIPLES OF OPERATION
Power On Reset
Application of power to the X5163/X5165 activates a
Power On Reset Circuit. This circuit goes active at 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 V
CC
value for 200ms (nominal) the circuit releases RESET/
RESET, allowing the processor to begin executing code.
exceeds the device V
TRIP
Low Voltage Monitoring
During operation, the X5163/X5165 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 a RESET/RESET signal. The CS/WDI pin
must be toggled from HIGH to LOW prior to the expira-
tion of the watchdog time out period. The state of two
nonvolatile control bits in the Status Register deter-
mine the watchdog timer period. The microprocessor
can change these watchdog bits, or they may be
“l(fā)ocked” by tying the WP pin LOW and setting the
WPEN bit HIGH.
V
The X5163/X5165 has a standard V
(V
TRIP
) voltage. This value will not change over normal
operating and storage conditions. However, in applica-
tions where the standard V
for higher precision in the V
X5165 threshold may be adjusted.
CC
Threshold Reset Procedure
CC
threshold
TRIP
is not exactly right, or
value, the X5163/
TRIP
Setting the V
This procedure sets the V
value. For example, if the current V
new V
TRIP
is 4.6V, this procedure directly makes the
change. If the new setting is lower than the current set-
ting, then it is necessary to reset the trip point before
setting the new value.
TRIP
Voltage
TRIP
to a higher voltage
is 4.4V and the
TRIP
To set the new V
threshold to the V
the WP pin HIGH. RESET and SO pins are left uncon-
nected. Then apply the programming voltage V
both SCK and SI and pulse CS/WDI LOW then HIGH.
Remove V
P
and the sequence is complete.
TRIP
CC
voltage, apply the desired V
pin and tie the CS/WDI pin and
TRIP
P
to
Figure 1. Set V
TRIP
Voltage
Resetting the V
This procedure sets the V
level. For example, if the current V
V
TRIP
is reset, the new V
1.7V. This procedure must be used to set the voltage to
a lower value.
TRIP
Voltage
TRIP
to a “native” voltage
is 4.4V and the
is something less than
TRIP
TRIP
To reset the V
2.7 and 5.5V to the V
WP pin, AND THE SCK pin HIGH. RESET and SO
pins are left unconnected. Then apply the program-
ming voltage V
P
to the SI pin ONLY and pulse CS/WDI
LOW then HIGH. Remove V
complete.
TRIP
voltage, apply a voltage between
pin. Tie the CS/WDI pin, the
CC
P
and the sequence is
Figure 2. Reset V
TRIP
Voltage
SCK
SI
V
P
V
P
CS
SCK
SI
V
CC
V
P
CS
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