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AFE5808ZCF 数据表(PDF) 24 Page - Texas Instruments |
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AFE5808ZCF 数据表(HTML) 24 Page - Texas Instruments |
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24 / 68 page  x x x x x x x x x x x x x x x x A7 A6 A5 A4 A3 A2 A1 A0 SEN SCLK SDATA SDOUT Start Sequence End Sequence t 7 t 6 t 2 t 4 t 1 t 5 t 3 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 t 8 AFE5808 SLOS688C – SEPTEMBER 2010 – REVISED APRIL 2012 www.ti.com SPI Timing Characteristics Minimum values across full temperature range TMIN = 0°C to TMAX = 85°C, AVDD_5V = 5V, AVDD = 3.3V, AVDD_ADC = 1.8V, DVDD = 1.8V PARAMETER DESCRIPTION MIN TYP MAX UNIT t1 SCLK period 50 ns t2 SCLK high time 20 ns t3 SCLK low time 20 ns t4 Data setup time 5 ns t5 Data hold time 5 ns t6 SEN fall to SCLK rise 8 ns t7 Time between last SCLK rising edge to SEN rising edge 8 ns t8 SDOUT Delay 12 20 28 ns Register Readout The device includes an option where the contents of the internal registers can be read back. This may be useful as a diagnostic test to verify the serial interface communication between the external controller and the AFE. First, the <REGISTER READOUT ENABLE> bit (Reg0[1]) needs to be set to '1'. Then user should initiate a serial interface cycle specifying the address of the register (A7-A0) whose content has to be read. The data bits are "don’t care". The device will output the contents (D15-D0) of the selected register on the SDOUT pin. SDOUT has a typical delay t8 of 20nS from the falling edge of the SCLK. For a lower speed, SCLK, SDOUT can be latched on the rising edge of SCLK. For higher speed, SCLK,e.g. the SCLK period lesser than 60nS, it would be better to latch the SDOUT at the next falling edge of SCLK. The following timing diagram shows this operation (the time specifications follow the same information provided. In the readout mode, users still can access the <REGISTER READOUT ENABLE> through SDATA/SCLK/SEN. To enable serial register writes, set the <REGISTER READOUT ENABLE> bit back to '0'. Figure 60. Serial Interface Register Read The AFE5808 SDOUT buffer is tri-stated and will get enabled only when 0[1] (REGISTER READOUT ENABLE) is enabled. SDOUT pins from multiple AFE5808s can be tied together without any pull-up resistors. Level shifter SN74AUP1T04 can be used to convert 1.8V logic to 2.5V/3.3V logics if needed. 24 Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): AFE5808 |
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