WS7808QM

Will Semiconductor Ltd.

Mar, 2018_V1.4

Power ON and OFF sequence

It is very important that the user adheres to the correct power-on/off sequence in order to avoid damaging the

device (Note 2).

Power ON

1) Apply voltage supply - VDD

2) Wait 100μs or greater and then apply logic supply - VIO

3) Wait 10μs or greater and then apply RFFE

4) Wait 5μs or greater after RFFE Trigger falling edge and then apply the RF Signal

Power OFF

1) Remove the RF Signal

2) Remove RFFE

3) Remove logic supply - VIO

4) Remove voltage supply - VDD

VDD

VDD

ON

VIO

ON

≥100us

VIO

Slave State

SDATA,SCLK

RF Signal

Shut Down

Start Up

Active

Shut Down

≥10us

REF

TRIGGER

RF

ON

VDD

OFF

RF

OFF

≥5us

≥100us

VIO

OFF

Note 2: VIO can be applied to the device after VDD or removed before VDD .

It is important to wait 10μs after VIO & VDD are applied

before sending SDATA to ensure correction data transmission. The minimum time between a power up and power down sequence (and

vice versa) is ≥ 100us.

Command Sequence Bit Definitions

Type

SSC

C11-C8

C7

C6-C5

C4

C3-C0

Parity

Bits

BPC

Extended Operation

DA7(1)-

DA0(1)

Parity

Bits

BPC

DA7(n)-

DA0(n)

Parity

Bits

BPC

Reg_0

Write

Y

SA[3:0]

1

Data[6:5]

Data[4]

Data{3:0]

Y

Y

-

-

-

-

-

-

Reg_1

Write

Y

SA[3:0]

0

10

Addr[4]

Data{3:0]

Y

-

Data[7:0]

-

-

-

Y

Y

Reg

Read

Y

SA[3:0]

0

11

Addr[4]

Data{3:0]

Y

Y

Data[7:0]

-

-

-

Y

Y

Legend:

SSC = Sequence start command

DA = Data/address frame bits

BC = Byte count (# of consecutive addresses)

C = Command frame bits

BPC = Bus park cycle