Datasheet > UCC2946-Q1

UCC2946-Q1

更新时间： 2024-11-24 12:22:35

品牌	Logo	应用领域
德州仪器 - TI		微处理器监控
页数	文件大小	规格书
13页	231K
描述
MICROPROCESSOR SUPERVISOR WITH WATCHDOG TIMER

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UCC2946-Q1 数据手册

UCC2946-Q1

www.ti.com ................................................................................................................................................. SGLS273B–OCTOBER 2004–REVISED MARCH 2009

MICROPROCESSOR SUPERVISOR WITH WATCHDOG TIMER

FEATURES

•

Qualified for Automotive Applications

Fully Programmable Reset Threshold

Fully Programmable Reset Period

Fully Programmable Watchdog Period

•

2% Accurate Reset Threshold

Input Voltage Down to 2 V

Input 18-µA Maximum Input Current

Reset Valid Down to 1 V

DESCRIPTION

The UCC2946 is designed to provide accurate microprocessor supervision, including reset and watchdog

functions. During power up, the device asserts a reset signal RES with VDD as low as 1 V. The reset signal

remains asserted until the VDD voltage rises and remains above the reset threshold for the reset period. Both

reset threshold and reset period are programmable by the user.

The UCC2946 is also resistant to glitches on the VDD line. Once RES has been deasserted, any drops below

the threshold voltage need to be of certain time duration and voltage magnitude to generate a reset signal.

These values are shown in Figure 1. An I/O line of the microprocessor may be tied to the watchdog input (WDI)

for watchdog functions. If the I/O line is not toggled within a set watchdog period, programmable by the user,

WDO is asserted. The watchdog function is disabled during reset conditions.

The UCC2946 is available in 8-pin TSSOP (PW) package to optimize board space.

VDD

POWER TO

CIRCUITRY

400 nA

RES

POWER ON RESET

1.235 V

RTH

8−BIT

COUNTER

400 nA

WDO

GND

100 mV

CLR

1.235 V

CLK

WATCHDOG

TIMING

EDGE DETECT

WDI

UDG−02192

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...13

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与UCC2946-Q1相关器件

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UCC2946TPWRQ1	TI	获取价格	MICROPROCESSOR SUPERVISOR WITH WATCHDOG TIMER
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UCC2960DR	ETC	获取价格	Analog IC
UCC2960DTR	TI	获取价格	IC 2 A SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO8, GREEN, SOIC-8, Switching R
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