EM357 datasheet(13/244 Pages) SILABS

13 / 244 page

EM351 / EM357

Pin #

Signal

Direction

Description

TRACEDATA1

Synchronous CPU trace data bit 1

Select 2- or 4-wire synchronous trace interface in ARM core

Enable trace interface in ARM core

Select alternate output function with GPIO_PCCFGL[3:0]

PB7

I/O

High

current

Digital I/O

ADC2

Analog

ADC Input 2

Enable analog function with GPIO_PBCFGH[15:12]

IRQC1

Default external interrupt source C

TIM1C2

Timer 1 channel 2 output

Enable timer output in TIM1_CCER

Select alternate output function with GPIO_PBCFGH[15:12]

TIM1C2

Timer 1 channel 2 input

Cannot be remapped

PB6

I/O

High

current

Digital I/O

ADC1

Analog

ADC Input 1

Enable analog function with GPIO_PBCFGH[11:8]

IRQB

External interrupt source B

TIM1C1

Timer 1 channel 1 output

Enable timer output in TIM1_CCER

Select alternate output function with GPIO_PBCFGH[11:8]

TIM1C1

Timer 1 channel 1 input

Cannot be remapped

PB5

I/O

Digital I/O

ADC0

Analog

ADC Input 0

Enable analog function with GPIO_PBCFGH[7:4]

TIM2CLK

Timer 2 external clock input

TIM1MSK

Timer 1 external clock mask input

VDD_CORE

Power

1.25 V digital core supply decoupling

VDD_PRE

Power

1.8 V prescaler supply

VDD_SYNTH

Power

1.8 V synthesizer supply

OSCB

I/O

24 MHz crystal oscillator or left open when using external clock input on

OSCA

I/O

24 MHz crystal oscillator or external clock input.

(An external clock input should only be used for test and debug

purposes. If used in this manner, the external clock input should be a

1.8 V, 50% duty cycle, square wave.)

GND

Ground

Ground supply pad in the bottom center of the package forms Pin 49.

See the various Silicon Labs EM35x Reference Design documentation for

PCB considerations.

1IRQC and IRQD external interrupts can be mapped to any digital I/O pin using the GPIO_IRQSEL and GPIO_IRQDSEL registers.

1-9

120-035X-000 Rev. 1.2

Final

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