SRC0 datasheet(5/48 Pages) STMICROELECTRONICS

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SRC0

Description

The SRC0 devices monitor the state of connected push-button(s) as well as sufficient

supply voltage. An enable output controls power for the application through the MOSFET

transistor, DC-DC converter, regulator, etc. If the supply voltage is above a precise voltage

threshold, the enable output can be asserted by a simple press of the button. Factory-

selectable supply voltage thresholds are determined by highly accurate and temperature-

compensated references. An interrupt is asserted by pressing the push-button during

normal operation and can be used to request a system power-down. The interrupt is also

asserted if undervoltage is detected. By a long push of one button (PB) or two buttons (PB

and SR) either a reset is asserted or power for the application is disabled depending on the

option used.

The device also offers additional features such as precise 1.5 V voltage reference with very

tight accuracy of 1%, separate output indicating undervoltage detection and separate output

for distinguishing between interrupt by push-button or undervoltage.

The device consumes very low current of 6 µA during normal operation and only 0.6 µA

current during standby.

The SRC0 is available in the TDFN12 package and is offered in several options among

features such as selectable threshold, hysteresis, timeouts, output types, etc.

Figure 1. Application hookup

A resistor is required for open drain output type only. A 10 k

 pull-up is sufficient in most applications.

Capacitor CREF is mandatory on VREF output (even if VREF is not used). Capacitor value of 1 µF is

recommended.

For the SRC0 the processor has to confirm the proper power-on during the fixed time period, tON_BLANK.

This failsafe feature prevents the user from turning on the system when there is a faulty power switch or an

unresponsive microprocessor.

SRC0

(3)

PB OUT

VREF

VCCLO

VCC

GND

INT

PS HOLD

RST

CSRD

EN (EN)

DC-DC converter,

power MOSFET,

regulator, etc.

LED

CSRD

CREF

(2)

(1)

AM00246v5

BASEBAND

RST

I/O

NMI or INT

I/O

VDD

MCU

CPU

(1)

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