参数资料
型号: X4003S8I-4.5A
元件分类: 电源管理
英文描述: 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
封装: PLASTIC, SOIC-8
文件页数: 14/18页
文件大小: 378K
代理商: X4003S8I-4.5A
X4003/X4005
Characteristics subject to change without notice.
5 of 18
REV 1.1.3 4/30/02
www.xicor.com
Figure 4. VTRIP Programming Sequence
VTRIP Programming
Apply 5V to VCC
Decrement VCC
RESET pin
goes active?
Measured VTRIP -
Desired VTRIP
DONE
Execute
Sequence
Reset VTRIP
Set VCC = VCC Applied =
Desired VTRIP
Execute
Sequence
Set VTRIP
New VCC Applied =
Old VCC applied + Error
(VCC = VCC–50mV)
Execute
Sequence
Reset VTRIP
New VCC Applied =
Old VCC Applied - Error
Error
≤ –Emax
-Emax < Error < Emax
YES
NO
Error
≥ Emax
Emax = Maximum Allowable VTRIP Error
Control Register
The control register provides the user a mechanism for
changing the watchdog timer settings. watchdog timer
bits are nonvolatile and do not change when power is
removed.
The control register is accessed with a special pream-
ble in the slave byte (1011) and is located at address
1FFh. It can only be modied by performing a control
register write operation. Only one data byte is allowed
for each register write operation. Prior to writing to the
control register, the WEL and RWEL bits must be set
using a two step process, with the whole sequence
requiring 3 steps. See "Writing to the Control Register"
below.
The user must issue a stop after sending the control
byte to the register to initiate the nonvolatile cycle that
stores WD1 and WD0. The X4003/X4005 will not
acknowledge any data bytes written after the rst byte
is entered.
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