LTC2932
7
2932fb
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 V
CC
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 (C
RT
) 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 confi gured 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 (V
PG
) 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 confi gured 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 V
CC
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.
