EEWORLDEEWORLDEEWORLD

Part Number

Search

X4285V8

Description
CPU Supervisor with 128K EEPROM
Categoryaccessories   
File Size853KB,22 Pages
ManufacturerIntersil ( Renesas )
Websitehttp://www.intersil.com/cda/home/
Download Datasheet View All

X4285V8 Overview

CPU Supervisor with 128K EEPROM

DATASHEET
X4283, X4285
128K, 16K x 8 Bit CPU Supervisor with 128K EEPROM
FEATURES
• Selectable watchdog timer
• Low V
CC
detection and reset assertion
—Four standard reset threshold voltages
—Adjust low V
CC
reset threshold voltage using
special programming sequence
—Reset signal valid to V
CC
= 1V
• Low power CMOS
—<20µA max standby current, watchdog on
—<1µA standby current, watchdog OFF
—3mA active current
• 128Kbits of EEPROM
—64 byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2, all or 64, 128, 256 or 512
bytes of EEPROM array with programmable
Block Lock
protection
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available packages
—8 Ld SOIC
—8 Ld TSSOP
• Pb-free plus anneal available (RoHS compliant)
DESCRIPTION
The X4283, X4285 combines four popular functions,
Power-on Reset Control, Watchdog Timer, Supply
Voltage Supervision, and Block Lock protect serial
EEPROM memory in one package. This combination
lowers system cost, reduces board space require-
ments, 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 protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable
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 V
CC
detection circuitry protects the
user’s system from low voltage conditions, resetting
the system when V
CC
falls below the set minimum V
CC
trip point. RESET/RESET is asserted until V
CC
returns
to proper operating level and stabilizes. Four industry
standard Vtrip thresholds are available, however, Inter-
sil’s unique circuits allow the threshold to be repro-
grammed to meet custom requirements or to fine-tune
the threshold for applications requiring higher precision.
FN8121
Rev 1.00
May 23, 2006
BLOCK DIAGRAM
Watchdog Transition
Detector
WP
SDA
Data
Register
Command
Decode &
Control
Logic
V
CC
Threshold
Reset logic
Block Lock Control
Protect Logic
Status
Register
EEPROM Array
8Kb 4Kb 4Kb
RESET (X4283)
RESET (X4285)
Reset &
Watchdog
Timebase
Watchdog
Timer Reset
SCL
S0
S1
V
CC
V
TRIP
+
-
Power-on and
Low Voltage
Reset
Generation
Kb=Kilobyte
FN8121 Rev 1.00
May 23, 2006
Page 1 of 22
BK3432 SDK Development and Use GuideBK3432 SDK Development and Use Guide
BK3432 SDK Development and Use Guide BK3432 SDK Development and Use GuideLow-power BLE4.2+3.0 dual-mode chip, suitable for electronic scales, POS machines, anti-lost devices, self-timers, remote contr...
无线大师 Integrated technical exchanges
Does anyone know where I can buy a mechanical switch like this?
I'm helping someone fix a device. This switch doesn't work. When I went there, they had already broken it. I don't know what kind of switch this is. Where can I buy an identical one? Otherwise, I'll h...
flashtt Analog electronics
Should copper be applied to the ground under the inductor?
1. It is best not to run signal lines under the inductor, as they will be seriously interfered with, especially for the inductor used for DCDC. The DI/DT on the inductor is very large, which will gene...
sfcsdc PCB Design
LTC4368 overvoltage and undervoltage value calculation problem
I encountered some problems in calculating the voltage divider resistors for overvoltage and undervoltage when using ltc4368. I hope you can help me solve them: 1. SHDN pin. I saw that some pins are c...
songwei2030 ADI Reference Circuit
[NXP Rapid IoT Review] UART0 Debug Serial Port-Debug Print Demo
[i=s]This post was last edited by yilonglucky on 2019-1-17 10:07[/i] There is a super simple project in the examples in the online IDE called Debug Print Demo. First, let’s analyze the schematic diagr...
yilonglucky RF/Wirelessly
Layout line width spacing routing teardrop vias [6 details to quickly improve the quality of PCB board layout]
PrefaceNowadays, many PCB Layout engineers complete the layout and routing according to the constraints given by hardware engineers or PI SI engineers, commonly known as "wire pullers" . If you don't ...
成都亿佰特 PCB Design

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
Copyright © 2005-2024 EEWORLD.com.cn, Inc. All rights reserved 京ICP证060456号 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号