FRDM-KW40Z datasheet(16/37 Pages) FREESCALE

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

Freescale Semiconductor, Inc.

FRDM-KW40Z development board

The DC-DC power configuration headers provide the DC-DC modes, and can be easily modified for the

desired mode. The connection configurations are described in Table 3:

NOTE

When configuring the Buck mode, SWD connector does not support J-Link

Lite. J-Link BASE is required. It is due to the 1.8 V operating mode.

Table 2. Power distribution headers

Supply

designation

Header

pins

Description

P3V3_BRD

1-2

Supply voltage to board peripherals

• Normally jumpered

• Jumper used to enable sensor, external flash memory, and buzzer on

board

• Leave open for lowest power

• Usage—measure the current or breakout for current consumption

P3V3_LED_PWR

J20

1-2

Supply voltage to power LED

• Normally jumpered

• Jumper used to enable green power LED on board

• Leave open for lowest power

• Usage—measure the LED current

V_MCU

J21

1-2

Supply voltage to MKW40Z SoC

• Normally jumpered

• Powers the MKW40Z SoC and transceiver

• Usage—measure or supply the MCU and radio current

Table 3. DC-DC power distribution headers

DC-DC mode

Reference

designator and

header pins

Description

Bypass

J18 1-2

J16 1-2

J17 3-4

J22 1-3, 2-4

Supply voltage to power Bypass mode

• Normally jumpered as primary mode

• Power level range 1.8 V–3.6 V

Buck

J18 2-4

J16 5-6

J17 3-4

J22 3-5

Supply voltage to power Buck mode

• Alternative configuration, related to Coin cell option

• Power level range 1.8 V–4.2 V

• DC-DC converter requires at least 2.1 V to start; the supply can drop to 1.8 V after

the DC-DC converter settles

Buck

Auto-Start

J18 2-4

J16 3-4

J17 3-4

J22 3-5

Supply voltage to power Buck Auto-Start mode

• Alternative configuration, related to Coin cell option

• Power level range 1.8 V–4.2 V

• DC-DC converter requires at least 2.1 V to start; the supply can drop to 1.8 V after

the DC-DC converter settles

Boost

J18 2-4

J16 3-4

J17 1-2, 5-6

J22 3-5

Supply voltage to power Boost mode

• Alternative configuration, related to single battery option

• Power level range 0.9 V–1.8 V

FRDM-KW40Z Datasheet(PDF) 16 Page - Freescale Semiconductor, Inc

FRDM-KW40Z Datasheet(HTML) 16 Page - Freescale Semiconductor, Inc

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