RDA5876 datasheet(12/22 Pages) RDA

12 / 22 page

RDA Microelectronics, Inc.

RDA5876 Datasheet V1.2

Page 12 of 22

Power Supply

The RDA5876 FM section integrated LDO which

supplies power to the chip. The external supply

voltage range is 1.8-5.5 V.

RESET and Control Interface select

The RDA5876 FM section is RESET itself When

VIO is Power up. And also support soft reset by

trigger 02H BIT1 from 0 to 1. The control interface

is I2C.

Control Interface

The I2C interface is compliant to I2C Bus

Specification 2.1. It includes two pins: SCL and

SDA. A I2C interface transfer begins with START

condition, a command byte and data bytes, each

byte has a followed ACK (or NACK) bit, and ends

with STOP condition. The command byte includes

a 7-bit chip address (0010000b) and a R/W bit.

The ACK (or NACK) is always sent out by receiver.

When in write transfer, data bytes is written out

from MCU, and when in read transfer, data bytes

is read out from RDA5876. There is no visible

I2C interface has a fixed start register address

(0x02h for write transfer and 0x0Ah for read

transfer), and an internal incremental address

counter. If register address meets the end of

back to 0x00h. For write transfer, MCU programs

registers from register 0x02h high byte, then

byte, till the last register. RDA5876 always gives

out ACK after every byte, and MCU gives out

STOP condition when register programming is

finished. For read transfer, after command byte

from MCU, RDA5876 sends out register 0x0Ah

high byte, then register 0x0Ah low byte, then

MCU. MCU gives out ACK for data bytes besides

last data byte. MCU gives out NACK for last data

byte, and then RDA5876 will return the bus to

MCU, and MCU will give out STOP condition.

Details please refer to RDA5876 Programming

Guide and RDA5802N Programming Guide and

Datasheet.

2S Audio Data Interface

The RDA5876 supports I

2S (Inter_IC Sound Bus)

audio interface. The interface is fully compliant

with I

2S bus specification. When setting I2SEN bit

high, RDA5876 will output SCK, WS, SD signals

from GPIO_FM3, GPIO_FM1, GPIO_FM2 as I

master and transmitter, the sample rate is

48Kbps ， 44.1kbps,32kbps….. RDA5876 also

support as I

2S slaver mode and transmitter, the

sample rate is less than 100kbps.

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