LTC2932I 查看數據表（PDF） - Linear Technology

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LTC2932I

Confi gurable Six Supply Monitor with Adjustable Reset Timer and Supply Tolerance

Linear Technology 

LTC2932

PIN FUNCTIONS

COMP5 (Pin 1): Comparator Output 5. Real-time logic

output with weak 6μA pull-up to V2. Pulls high when V5

is above reset threshold. May be pulled greater than V2

using external pull-up. Leave open if unused.

V5 (Pin 2): Adjustable Voltage Input 5. High impedance

comparator input with 0.5V typical threshold. See

Applications Information for details. Tie to V1 if unused.

COMP3 (Pin 3): Comparator Output 3. Real-time logic

output with weak 6μA pull-up to V2. Pulls high when V3

is above reset threshold. May be pulled greater than V2

using external pull-up. Leave open if unused.

COMP1 (Pin 4): Comparator Output 1. Real-time logic

output with weak 6μA pull-up to V2. Pulls high when V1

is above reset threshold. May be pulled greater than V2

using external pull-up. Leave open if unused.

V3 (Pin 5): Voltage Input 3. Select from 2.5V, 1.8V, 1.5V,

or ADJ. See Applications Information for details. Tie to

V1 if unused.

V1 (Pin 6): Voltage Input 1. Select from 5V or 3.3V. See

Applications Information for details. The greater of V1 or

V2 is also VCC for the device. Bypass this pin to ground

with a 0.1μF (or greater) capacitor.

CRT (Pin 7): Reset Timeout Capacitor. Attach an external

capacitor (CRT) to GND to set a reset timeout of 2ms/nF.

Leaving the pin open generates a minimum delay of

approximately 25μs. A 47nF capacitor generates a 94ms

reset delay time.

RST (Pin 8): Reset Output. Logic output with weak 6μA

pull-up to V2. Pulls low when any voltage input is below

the reset threshold and held low for the configured delay

time after all voltage inputs are above threshold. May be

pulled greater than V2 using external pull-up. Leave open

if unused.

T0 (Pin 9): Supply Tolerance Selection Input. Used in

conjunction with T1 (Pin 11). See Applications Informa-

tion for tolerance selection chart (Table 2). Choose from

5%, 7.5%, 10% or 12.5%.

RDIS (Pin 10): Digital Input for RST Disable. A low input

on this pin forces RST to V2 (or to the pull-up voltage).

Useful for determining supply margins without issuing a

reset. A weak internal pull-up allows pin to be left open

for normal monitor operation.

T1 (Pin 11): Supply Tolerance Selection Input. Used in

conjunction with T0 (Pin 9). See Applications Information

for tolerance selection chart (Table 2). Choose from 5%,

7.5%, 10% or 12.5%.

GND (Pin 12): Ground.

VPG (Pin 13): Threshold Select Input. Connect to an

external 1% resistive divider between VREF and GND to

select 1 of 16 combinations and/or ±adjustable voltage

thresholds (see Table 1). Do not add capacitance on the

VPG pin.

VREF (Pin 14): Buffered Reference Voltage Output. A

1.210V nominal reference used for the mode selection

voltage (VPG) and for the offset of negative adjustable

applications. The buffered reference can source and sink

up to 1mA. The reference can drive a bypass capacitor of

up to 1000pF without oscillation.

V4 (Pin 15): Voltage Input 4. Select from 1.8V, 1.5V, ADJ

or –ADJ. See Applications Information for details. Tie to

V1 if unused and configured for positive voltage.

V2 (Pin 16): Voltage Input 2. Select from 3.3V, 3V or 2.5V.

See Applications Information for details. The greater of V1,

V2 is also VCC for the device. Bypass this pin to ground

with a 0.1μF (or greater) capacitor. All status outputs are

weakly pulled up to V2.

COMP4 (Pin 17): Comparator Output 4. Real-time logic

output with weak 6μA pull-up to V2. Pulls high when V4

is above reset threshold. May be pulled greater than V2

using external pull-up. Leave open if unused.

COMP2 (Pin 18): Comparator Output 2. Real-time logic

output with weak 6μA pull-up to V2. Pulls high when V2

is above reset threshold. May be pulled greater than V2

using external pull-up. Leave open if unused.

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