EM3581-RTR datasheet(32/59 Pages) SILABS

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EM358x

Rev 1.0

4.5. Integrated Voltage Regulator

The EM358x integrates two low dropout regulators to provide 1.8 V and 1.25 V power supplies. The 1V8 regulator

supplies the analog and memories, and the 1V25 regulator supplies the digital core. In deep sleep the voltage

regulators are disabled. An external 1.8 V regulator may replace both internal regulators. The always-on domain

needs to be minimally powered at 2.1 V, and cannot be powered from the external 1.8 V regulator.

Refer to chapter 6 in the Ember EM358x Reference Manual for more information.

4.6. Peripherals

4.6.1. GPIO

The EM358x has 24 multi-purpose GPIO pins, which may be individually configured as:



General purpose output



General purpose open-drain output



Alternate output controlled by a peripheral device



Alternate open-drain output controlled by a peripheral device



Analog



General purpose input



General purpose input with pull-up or pull-down resistor

The 24 GPIO pins are grouped into three ports. Each pin has a 4-bit configuration value in its GPIO_PxCFGH/L

addition to GPIO_PxCFGH/L determine which peripheral controls the output. For some GPIOs the

GPIO_PxCFGH/L configuration will be overridden. These functions are forced when the EM358x is reset and

remain forced until software or an external debugger overrides the forced functions.

Refer to chapter 7 in the

Ember EM358x Reference Manual for more information.

4.6.2. Serial Controllers

The EM358x has two serial controllers, SC1 and SC2, which provide several options for full-duplex synchronous

and asynchronous serial communications.



SPI (Serial Peripheral Interface), master or slave



TWI (Two Wire serial Interface), master only



UART (Universal Asynchronous Receiver/Transmitter), SC1 only



Receive and transmit FIFOs and DMA channels, SPI and UART modes

Both SC1 and SC2 SPI controllers include an SPI master controller with the following features:



Full duplex operation



Programmable clock frequency (12 MHz max.)



Programmable clock polarity and phase



Selectable data shift direction (either LSB or MSB first)



Receive and transmit FIFOs



Receive and transmit DMA channels

Both SC1 and SC2 SPI controllers include a SPI slave controller with these features:



Full duplex operation



Up to 5 Mbps data transfer rate



Programmable clock polarity and clock phase



Selectable data shift direction (either LSB or MSB first)



Slave select input

Both SC1 and SC2 include a Two Wire serial Interface (TWI) master controller with the following features:



Uses only two bidirectional GPIO pins



Programmable clock frequency (up to 400 kHz)



Supports both 7-bit and 10-bit addressing

EM3581-RTR Datasheet(PDF) 32 Page - Silicon Laboratories

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