X4003M8I-2.7A Datasheet PDF - Xicor
| Part Number | X4003M8I-2.7A | |
| Description | CPU Supervisor | |
| Manufacturers | Xicor | |
| Logo |  |
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X4003/X4005
CPU Supervisor
FEATURES
• Selectable watchdog timer
—Select 200ms, 600ms, 1.4s, off
• Low VCC detection and reset assertion
—Five standard reset threshold voltages
nominal 4.62V, 4.38V, 2.92V, 2.68V, 1.75V
—Adjust low VCC reset threshold voltage using
special programming sequence
—Reset signal valid to VCC = 1V
• Low power CMOS
—12µA typical standby current, watchdog on
—800nA typical standby current watchdog off
—3mA active current
• 400kHz I2C interface
• 1.8V to 5.5V power supply operation
• Available packages
—8-lead SOIC
—8-lead MSOP
BLOCK DIAGRAM
DESCRIPTION
These devices combine three popular functions, Power-
on Reset Control, Watchdog Timer, and Supply Voltage
Supervision. This combination lowers system cost,
reduces board space requirements, and increases
reliability.
Applying power to the device activates the power on
reset circuit which holds RESET/RESET active for a
period of time. This allows the power supply and oscilla-
tor to stabilize before the processor can execute code.
The Watchdog Timer provides an independent
protection mechanism for microcontrollers. When the
microcontroller fails to restart a timer within a select-
able time out interval, the device activates the RESET/
RESET signal. The user selects the interval from three
preset values. Once selected, the interval does not
change, even after cycling the power.
The device’s low VCC detection circuitry protects the
user’s system from low voltage conditions, resetting the
system when VCC falls below the minimum VCC trip
point. RESET/RESET is asserted until VCC returns to
proper operating level and stabilizes. Five industry stan-
dard VTRIP thresholds are available; however, Xicor’s
unique circuits allow the threshold to be reprogrammed
to meet custom requirements, or to fine-tune the thresh-
old for applications requiring higher precision.
WP
SDA
SCL
VCC
Watchdog Transition
Detector
Data
Register
Command
Decode &
Control
Logic
VCC Threshold
Reset logic
Control
Register
VTRIP
+
-
Watchdog
Timer Reset
Reset &
Watchdog
Timebase
Power on and
Low Voltage
Reset
Generation
RESET (X4003)
RESET (X4005)
REV 1.1.3 4/30/02
www.xicor.com
Characteristics subject to change without notice. 1 of 18
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X4003/X4005
Figure 4. VTRIP Programming Sequence
VTRIP Programming
Execute
Reset VTRIP
Sequence
Set VCC = VCC Applied =
Desired VTRIP
New VCC Applied =
Old VCC Applied - Error
Execute
Reset VTRIP
Sequence
Execute
Set VTRIP
Sequence
Apply 5V to VCC
Decrement VCC
(VCC = VCC–50mV)
New VCC Applied =
Old VCC applied + Error
RESET pin
goes active?
YES
Error ≥ Emax
Measured VTRIP -
Desired VTRIP
-Emax < Error < Emax
DONE
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 modified 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 first byte
is entered.
REV 1.1.3 4/30/02
www.xicor.com
Characteristics subject to change without notice. 5 of 18
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for X4003M8I-2.7A electronic component. |
| Information | Total 18 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ X4003M8I-2.7A.PDF Datasheet ] | |
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