LTC2931HF 查看數據表（PDF） - Linear Technology

零件编号

产品描述 (功能)

生产厂家

LTC2931HF

Confi gurable Six Supply Monitor with Adjustable Reset and Watchdog Timers

Linear Technology 

LTC2931

FEATURES

Configurable Six Supply

Monitor with Adjustable Reset

and Watchdog Timers

DESCRIPTION

■ Simultaneously Monitors Six Supplies

■ 16 User Selectable Combinations of

5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and ± Adjustable

Voltage Thresholds

■ Guaranteed Threshold Accuracy: ±1.5%

■ Adjustable Reset and Watchdog Timeout

■ Low Supply Current: 52μA

■ Comparator/Monitor Output for Each Supply

■ Power Supply Glitch Immunity

■ Guaranteed RST for VCC ≥ 1V

■ High Temperature Operation to 125°C

■ 20-Lead TSSOP Package

APPLICATIONS

■ Desktop and Notebook Computers

■ Multivoltage Systems

■ Telecom Equipment

■ Portable Battery-Powered Equipment

■ Network Servers

■ Automotive

The LTC®2931 is a configurable supply monitor for

systems with up to six supply voltages. One of 16 preset or

adjustable voltage monitor combinations can be selected

using an external resistive divider connected to the mode

select pin. The preset voltage thresholds are accurate

to ±1.5% over temperature. The LTC2931 also features

adjustable inputs with a 0.5V nominal threshold. All six

open-drain voltage comparator outputs are connected to

separate pins for individual supply monitoring.

The reset and watchdog timeout periods are adjustable

using external capacitors. Tight voltage threshold accuracy

and glitch immunity ensure reliable reset operation without

false triggering. The RST output is guaranteed to be in the

correct state for VCC down to 1V. Each status output has

a weak internal pull-up and may be externally pulled up

to a user defined voltage.

The 52μA supply current makes the LTC2931 ideal for

power conscious systems and it may be configured to

monitor fewer than six inputs.

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 6967591, 7239251, 7119714.

TYPICAL APPLICATION

Six Supply Monitor 12V (ADJ), 5V, 3.3V, 2.5V, 1.8V, 1.2V (ADJ)

12V

5V

3.3V

SYSTEM

2.5V

LOGIC

1.8V

1.2V

10k

2150k 124k

1% 1%

0.1μF

0.1μF

100k 100k

1% 1% R1

59k

1%

R2

40.2k

1%

V1

V2

V3

V4

V5

V6

VREF

VPG

GND

POWER

GOOD

LTC2931

WDI

WDO

RST

2931 TA01

tRST = 94ms

CWT

CRT tWD = 940ms

CWT

47nF

CRT

47nF

Voltage Threshold Configuration Table

V1 (V) V2 (V) V3 (V) V4 (V) V5 (V) V6 (V)

5.0 3.3 2.5 1.8 ADJ ADJ

5.0 3.3 2.5 1.5 ADJ ADJ

5.0 3.3 2.5 ADJ ADJ ADJ

5.0 3.3 1.8 ADJ ADJ ADJ

5.0 3.3 1.8 –ADJ ADJ ADJ

5.0 3.3 ADJ ADJ ADJ ADJ

5.0 3.3 ADJ –ADJ ADJ ADJ

5.0 3.0 2.5 ADJ ADJ ADJ

5.0 3.0 1.8 ADJ ADJ ADJ

5.0 3.0 ADJ ADJ ADJ ADJ

3.3 2.5 1.8 1.5 ADJ ADJ

3.3 2.5 1.8 ADJ ADJ ADJ

3.3 2.5 1.8 –ADJ ADJ ADJ

3.3 2.5 1.5 ADJ ADJ ADJ

3.3 2.5 ADJ ADJ ADJ ADJ

3.3 2.5 ADJ –ADJ ADJ ADJ

2931fb

1

Share Link: