參數(shù)資料
型號(hào)： X5648S14
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, PDSO14
封裝： PLASTIC, SOIC-14
文件頁數(shù)： 3/18頁
文件大小： 300K
代理商： X5648S14
3
FN8136.0
March 17, 2005
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 V
CC
exceeds the device V
TRIP
value for 200ms (nominal) the circuit releases
RESET/RESET, allowing the processor to begin exe-
cuting code.
Low Voltage Monitoring
During operation, the X5648/X5649 monitors the V
CC
level and asserts RESET/RESET if supply voltage
falls
below
a
preset
RESET/RESET 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
CC
returns and exceeds V
TRIP
for 200ms.
minimum
V
TRIP
.
The
V
CC
Threshold Reset Procedure
The X5648/X5649 has a standard V
CC
threshold
(V
TRIP
) voltage. This value will not change over normal
operating and storage conditions. However, in applica-
tions 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.
Setting the V
TRIP
Voltage
This procedure sets the V
TRIP
to a higher voltage
value. For example, if the current V
TRIP
is 4.4V and
the new 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.
To set the new V
TRIP
voltage, apply the desired V
TRIP
threshold to the Vcc pin and tie the CS pin and the WP
pin HIGH. RESET/RESET and SO pins are left uncon-
nected. Then apply the programming voltage V
P
to
both SCK and SI and pulse CS LOW then HIGH.
Remove V
P
and the sequence is complete.
Figure 1. Set V
TRIP
Voltage
Resetting the V
TRIP
Voltage
This procedure sets the V
TRIP
to a “native” voltage
level. For example, if the current V
TRIP
is 4.4V and the
V
TRIP
is reset, the new V
TRIP
is something less than
1.7V. This procedure must be used to set the voltage
to a lower value.
To reset the V
TRIP
voltage, apply a voltage between 2.7
and 5.5V to the V
CC
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 volt-
age V
P
to the SI pin ONLY and pulse CS LOW then
HIGH. Remove V
P
and the sequence is complete.
Figure 2. Reset V
TRIP
Voltage
SCK
SI
V
P
V
P
CS
SCK
SI
V
CC
V
P
CS
X5648, X5649
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