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參數(shù)資料
| 型號： | X5323V14I-2.7T1 |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封裝： | PLASTIC, TSSOP-14 |
| 文件頁數(shù)： | 15/21頁 |
| 文件大?。?/td> | 200K |
| 代理商： | X5323V14I-2.7T1 |
X5323/X5325
Characteristics subject to change without notice.
3 of 21
REV 1.1.2 11/13/01
www.xicor.com
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 insufcient 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 instruc-
tion. 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 brownout 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 tog-
gled 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 watch-
dog 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 applica-
tions 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 set-
ting, 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.
Figure 1. Set VTRIP Voltage
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
2.7 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 program-
ming voltage VP to the SI pin ONLY and pulse CS/WDI
LOW then HIGH. Remove VP and the sequence is
complete.
Figure 2. Reset VTRIP Voltage
SCK
SI
VP
CS
SCK
SI
VCC
VP
CS
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