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AK7707 Datasheet(PDF) 25 Page - Asahi Kasei Microsystems |
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AK7707 Datasheet(HTML) 25 Page - Asahi Kasei Microsystems |
25 / 34 page [AK7707] 016011589-E-00-PB 2016/11 - 25 - ■ SPI Interface 1. Clock Reset (CKRESETN bit = “0”) (Ta = −40~85ºC; VDD12 = 1.14~1.3V; AVDD = 3.13~3.47V; VDD33 = 3.13~3.47V; TVDD1 = 1.7~3.47V; TVDD2 = 1.7~3.47V; VSS1~6 = 0V; CL = 20pF) Parameter Symbol Min. Typ. Max. Unit μP Interface Signal SCLK Frequency fSCLK 3.5 MHz SCLK Low-level Width tSCLKL 135 ns SCLK High-level Width tSCLKH 135 ns Microcontroller → AK7707 CSN High-level Width tWRQH 300 ns From CSN “↑” to PDN “↑” tRST 360 ns From PDN “↑” to CSN “↓” tIRRQ 1 ms From CSN “↓” to SCLK “↓” tWSC 300 ns From SCLK “↑” to CSN “↑” tSCW 480 ns SI Latch Setup Time tSIS 120 ns SI Latch Hold Time tSIH 120 ns AK7707 → Microcontroller Delay Time from SCLK “↓” to SO Output tSOS 120 ns SO Output Hold Time from SCLK “↑” (* 29) tSOH 120 ns Note: * 29. Except when writing the 8th bit of the command code. 2. PLL Lock (CKRESETN bit = “1” and PLL is locked) (Ta = −40~85ºC; VDD12 = 1.14~1.3V; AVDD = 3.13~3.47V; VDD33 = 3.13~3.47V; TVDD1 = 1.7~3.47V; TVDD2 = 1.7~3.47V; VSS1~6 = 0V; CL = 20pF) Parameter Symbol Min. Typ. Max. Unit μP Interface Signal SCLK Frequency (* 30) fSCLK 7 MHz SCLK Low-level Width tSCLKL 60 ns SCLK High-level Width tSCLKH 60 ns Microcontroller → AK7707 CSN High-level Width tWRQH 150 ns From CSN “↑” to PDN “↑” tRST 180 ns From PDN “↑” to CSN “↓” tIRRQ 1 ms From CSN “↓” to SCLK “↓” tWSC 150 ns From SCLK “↑” to CSN “↑” tSCW 240 ns SI Latch Setup Time tSIS 60 ns SI Latch Setup Time tSIH 60 ns AK7707 → Microcontroller Delay Time from SCLK “↓” to SO Output tSOS 60 ns SO Output Hold Time from SCLK “↑” (* 29) tSOH 60 ns Note: * 30. It takes maximum 10ms to lock PLL after setting CKRESETN bit = “0”→ “1”. Control registers can always be accessed by 7MHz. |
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