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NRF52811-QCAA-R Datasheet(PDF) 138 Page - Nordic Semiconductor |
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NRF52811-QCAA-R Datasheet(HTML) 138 Page - Nordic Semiconductor |
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138 / 444 page  Peripherals 6.10.7.15 PSEL.DIN Address offset: 0x544 Pin number configuration for PDM DIN signal Bit number 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ID B A A A A A Reset 0xFFFFFFFF 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ID Access Field Value ID Value Description A RW PIN [0..31] Pin number B RW CONNECT Connection Disconnected 1 Disconnect Connected 0 Connect 6.10.7.16 SAMPLE.PTR Address offset: 0x560 RAM address pointer to write samples to with EasyDMA Bit number 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ID A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A Reset 0x00000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ID Access Field Value ID Value Description A RW SAMPLEPTR Address to write PDM samples to over DMA 6.10.7.17 SAMPLE.MAXCNT Address offset: 0x564 Number of samples to allocate memory for in EasyDMA mode Bit number 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ID A A A A A A A A A A A A A A A Reset 0x00000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ID Access Field Value ID Value Description A RW BUFFSIZE [0..32767] Length of DMA RAM allocation in number of samples 6.10.8 Electrical specification 6.10.8.1 PDM Electrical Specification Symbol Description Min. Typ. Max. Units fPDM,CLK PDM clock speed 1.032 MHz tPDM,JITTER Jitter in PDM clock output 20 ns TdPDM,CLK PDM clock duty cycle 40 50 60 % tPDM,DATA Decimation filter delay 5 ms tPDM,cv Allowed clock edge to data valid 125 ns tPDM,ci Allowed (other) clock edge to data invalid 0 ns tPDM,s Data setup time at fPDM,CLK=1.024 MHz 65 ns tPDM,h Data hold time at fPDM,CLK=1.024 MHz 0 ns GPDM,default Default (reset) absolute gain of the PDM module 3.2 dB 4454_140 v1.0 138 |
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