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WS7808QM Datasheet(PDF) 7 Page - Will Semiconductor Ltd. |
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WS7808QM Datasheet(HTML) 7 Page - Will Semiconductor Ltd. |
7 / 12 page 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 |
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