STMPE2403 datasheet(58/63 Pages) STMICROELECTRONICS

Part #	STMPE2403

Description	24-bit Enhanced port expander with Keypad and PWM controller Xpander logic

PDF	63 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Miscellaneous features

STMPE2403

58/63

Miscellaneous features

14.1

Reset

STMPE2403 is equipped with an internal POR circuit that holds the device in reset state,

until the clock is steady and VCC input is valid. Host system may choose to reset the

STMPE2403 by asserting Reset_N pin.

14.2

Under Voltage Lockout

STMPE2403 is equipped with an internal UVLO circuit that generates a RESET signal,

when the main supply voltage falls below the allowed threshold.

14.3

Clock output

STMPE2403 provides a buffered 32KHz clock output at one of the GPIO as alternate

function. This clock could be used for cascading of multiple port expander devices, using

just 1 XTAL unit.

14.4

Crystal oscillator

STMPE2403 provides the option to use a crystal oscillator to provide the 32KHz clock.

Figure 14. Recommended schematics if external XTAL is used

STMPE2403

XTALIN

XTALOUT

GND

32KHz

27pF

STMPE2403 Datasheet(PDF) 58 Page - STMicroelectronics