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TS4855 Scheda tecnica(PDF) 3 Page - STMicroelectronics |
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TS4855 Scheda tecnica(HTML) 3 Page - STMicroelectronics |
3 / 27 page SPI Bus Interface TS4855 3/27 2 SPI BUS INTERFACE 2.1 Pin Descriptions 2.2 SPI Operation Description The serial data bits are organized into a field containing 8 bits of data as shown in Table 1. The DATA 0 to DATA 2 bits determine the output mode of the TS4855 as shown in Table 2. The DATA 3 to DATA 7 bits determine the gain level setting as illustrated by Table 3. For each SPI transfer, the data bits are written to the DATA pin with the least significant bit (LSB) first. All serial data are sampled at the rising edge of the CLK signal. Once all the data bits have been sampled, ENB transitions from logic-high to logic low to complete the SPI sequence. All 8 bits must be received before any data latch can occur. Any excess CLK and DATA transitions will be ignored after the height rising clock edge has occurred. For any data sequence longer than 8 bits, only the first 8 bits will get loaded into the shift register and the rest of the bits will be disregarded. (SD = Shut Down Mode, PHS = Non Filtered Phone In HS, PIHF = External High Pass Filtered Phone In IHF) Pin Functional Description DATA This is the serial data input pin CLK This is the clock input pin ENB This is the SPI enable pin active at high level Table 1: Bit Allocation DATA MODES LSB DATA 0 Mode 1 DATA 1 Mode 2 DATA 2 Mode 3 DATA 3 gain 1 DATA 4 gain 2 DATA 5 gain 3 DATA 6 gain 4 MSB DATA 7 gain 5 Table 2: Output Mode Selection Output Mode # DATA 2 DATA 1 DATA 0 SPKRout Rout Lout 0 0 0 0 SD SD SD 10 0 1 +12dBxPIHF SD SD 20 1 0 MUTE G1xPHS G1xPHS 30 1 1 +12dBxPIHF G1xPHS G1xPHS 41 0 0 MUTE G2xRin G2xLin 51 0 1 +12dBxPIHF G2xRin G2xLin 61 1 0 MUTE G1xPHS+ G2xRin G1xPHS+ G2xLin 71 1 1 +12dBxPIHF G1xPHS+ G2xRin G1xPHS+ G2xLin |
Codice articolo simile - TS4855_04 |
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Descrizione simile - TS4855_04 |
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