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AS8501 Scheda tecnica(PDF) 30 Page - ams AG |
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AS8501 Scheda tecnica(HTML) 30 Page - ams AG |
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30 / 41 page ![]() AS8501 - Data Sheet austriamicrosystems Revision 1.1, 04-April-06 www.austriamicrosystems.com Page 29 of 40 SDI bus timing Nr. PARAMETER SYMBOL MIN TYP MAX Unit Conditions NOTE 0 SCLK pulse width PW_sclk 120 ns All 1 SCLK low LO_sclk 120 ns All 5), 6) 2 Master SDAT exception after SCLK MDE 120 ns All 3 Master SDAT valid before/after SCLK DV_m 120 TSW ns All 1) 4 Slave SDAT not valid after SCLK DV_s 120 ns Master read 5 Master 3-state ON/OFF TS_m TS_s TSW ns Master read 6 Slave 3-state ON/OFF TS_s 120 ns Master read 7 Bus condition detection disabled in slave unit CDD ns Master read 3) Notes: 1) TSW is typical time required by the microcontroller program to change or to read the state of the I/O pin 3) Start detection is disabled when slave unit transmits data 5) LO_sclk>300ns and PW_sclk> 2µsec required to read ZZR. 6) LO_sclk > (3/2)*TCLK = (3/2)/f CLK = (3/2)/8MHz=187.5ns required for results synchronisation in MSR. 8.6 SDI access to OTP memory SDI can read the OTP memory in any mode by reading the register ZZR. 8.6.1 ZZR register bit mapping Cell index 0 1 2 3 4 5 6 7 Purpose pos A 1) pos B 2) pos C 3) lock A 4) lock B 5) trimcs trimc3 trimc2 ZZR field ZLO ZLO ZLO ZLO ZLO ZTR ZTR ZTR ZZR bit 187 (msb) 186 185 184 183 182 181 180 1) Always programmed to '0' during the production test 2) Always programmed to '0' during the production test 3) Always programmed to '1' during the production test 4) Reserved 5) Reserved |
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