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SI4844-B20 Datasheet(PDF) 6 Page - Silicon Laboratories |
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SI4844-B20 Datasheet(HTML) 6 Page - Silicon Laboratories |
6 / 27 page Si4844-B20 6 Rev. 1.0 Table 4. 2-Wire Control Interface Characteristics1,2,3 (VDD = 2.7 to 3.6 V, TA = –15 to 85 °C) Parameter Symbol Test Condition Min Typ Max Unit SCLK Frequency fSCLK 0— 400 kHz SCLK Low Time tLOW 1.3 — — µs SCLK High Time tHIGH 0.6 — — µs SCLK Input to SDIO Setup (START) tSU:STA 0.6 — — µs SCLK Input to SDIO Hold (START) tHD:STA 0.6 — — µs SDIO Input to SCLK Setup tSU:DAT 100 — — ns SDIO Input to SCLK Hold4,5 tHD:DAT 0— 900 ns SCLK input to SDIO Setup (STOP) tSU:STO 0.6 — — µs STOP to START Time tBUF 1.3 — — µs SDIO Output Fall Time tf:OUT —250 ns SDIO Input, SCLK Rise/Fall Time tf:IN tr:IN —300 ns SCLK, SDIO Capacitive Loading Cb —— 50 pF Input Filter Pulse Suppression tSP — — 50 ns Notes: 1. When VD = 0 V, SCLK and SDIO are low impedance. 2. When selecting 2-wire mode, the user must ensure that a 2-wire start condition (falling edge of SDIO while SCLK is high) does not occur within 300 ns before the rising edge of RST. 3. When selecting 2-wire mode, the user must ensure that SCLK is high during the rising edge of RST, and stays high until after the first start condition. 4. The Si484x delays SDIO by a minimum of 300 ns from the VIH threshold of SCLK to comply with the minimum tHD:DAT specification. 5. The maximum tHD:DAT has only to be met when fSCLK = 400 kHz. At frequencies below 400 kHz, tHD:DAT may be violated as long as all other timing parameters are met. 20 0.1 Cb 1pF ----------- + 20 0.1 Cb 1pF ----------- + |
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