參數(shù)資料
型號(hào)： X5323S8Z-2.7A-T1
廠商： INTERSIL CORP
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
封裝： ROHS COMPLIANT, PLASTIC, SOIC-8
文件頁(yè)數(shù)： 16/20頁(yè)
文件大?。?/td> 341K
代理商： X5323S8Z-2.7A-T1
5
FN8131.2
June 30, 2008
Principles of Operation
Power-on Reset
Application of power to the X5323/X5325 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. As
long as RESET/RESET pin is active, the device will not
respond to any Read/Write instruction. When VCC exceeds
the device VTRIP value for 200ms (nominal) the circuit
releases RESET/RESET, allowing the processor to begin
executing code.
Low Voltage Monitoring
During operation, the X5323/X5325 monitors the VCC level
and asserts RESET/RESET if supply voltage falls below a
preset minimum VTRIP. The RESET/RESET signal prevents
the microprocessor from operating in a power fail or
brown-out condition. The RESET/RESET signal remains
active until the voltage drops below 1V. It also remains active
until VCC returns and exceeds VTRIP for 200ms.
Watchdog Timer
The watchdog timer circuit monitors the microprocessor
activity by monitoring the WDI input. The microprocessor 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 expiration of the watchdog
time out period. The state of two nonvolatile control bits in
the status register determine 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.
VCC Threshold Reset Procedure
The X5323/X5325 has a standard VCC threshold (VTRIP)
voltage. This value will not change over normal operating
and storage conditions. However, in applications where the
standard VTRIP is not exactly right, or for higher precision in
the VTRIP value, the X5323/X5325 threshold may be
adjusted.
Setting the VTRIP Voltage
This procedure sets the VTRIP to a higher voltage value. For
example, if the current VTRIP is 4.4V and the new VTRIP 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 VTRIP voltage, apply the desired VTRIP
threshold to the VCC pin and tie the CS/WDI 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/WDI LOW then HIGH.
Remove VP and the sequence is complete.
Resetting the VTRIP Voltage
This procedure sets the VTRIP to a “native” voltage level. For
example, if the current VTRIP is 4.4V and the VTRIP is reset,
the new VTRIP is something less than 1.7V. This procedure
must be used to set the voltage to a lower value.
To reset the VTRIP voltage, apply a voltage between 2.7V
and 5.5V to the VCC pin. Tie the CS/WDI 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/WDI LOW then HIGH. Remove
VP and the sequence is complete.
SCK
SI
VP
CS
FIGURE 1. SET VTRIP VOLTAGE
SCK
SI
VCC
VP
CS
FIGURE 2. RESET VTRIP VOLTAGE
X5323, X5325
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