FRDM-KW40Z datasheet(20/37 Pages) FREESCALE

Part #	FRDM-KW40Z

Description	FRDM-KW40Z Freescale Freedom Development Board

PDF	37 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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20 / 37 page

FRDM-KW40Z Freescale Freedom Development Board User’s Guide, Rev. 2, 10/2015

Freescale Semiconductor, Inc.

FRDM-KW40Z development board

4.2.4.3

Buzzer

Component BZ500 is is a piezoelectric transducer (MPN: AST1109MLTRQ). Use the buzzer for sound

applications. Figure 17 shows the buzzer circuit. PWM signal is required to enable the buzzer.

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The buzzer power supply is P3V3_BRD.

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The resonant frequency is 4.0 kHz.

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Buzzer is driven by Q1 and MCU output PTB3 signal.

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The driven signal can be shared with other peripherals through the J1 pin 16.

Figure 17. Buzzer circuit

4.2.4.4

Potentiometer (ADC interface)

Use the 5 k potentiometer (R67) for ADC verification and applications. Figure 18 shows the

potentiometer circuit.

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The POT power supply can be either the P3V3 or V_BATT for the input source.

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A single-turn potentiometer is provided.

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Signal is routed through ADC0_SE.

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The ADC trace can be shared with other peripherals through the J4 pin 3.

FRDM-KW40Z Datasheet(PDF) 20 Page - Freescale Semiconductor, Inc