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BU64985GWZ Datasheet(PDF) 6 Page - Rohm |
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BU64985GWZ Datasheet(HTML) 6 Page - Rohm |
6 / 25 page 6/21 TSZ02201-0K1K0B601860-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 6. Oct.2016 Rev.003 www.rohm.com TSZ22111・15・001 BU64985GWZ Characteristics of the SDA and SCL Bus Lines for 2-wire Serial Interface (Ta = 25 °C, VDD = 1.6 to 1.98V) Parameter Symbol STANDARD- MODE(Note 4) FAST-MODE(Note 4) Fm+(Note 4) Unit Min Max Min Max Min Max Hysterics of Schmitt trigger inputs Vhys - - 0.05VDD - 0.05VDD - V Pulse width of spikes which must be suppressed by the input filter tSP 0 50 0 50 0 50 ns Hold time (repeated) START condition. After this period, the first clock pulse is generated tHD;STA 4.0 - 0.6 - 0.26 - µs LOW period of the SCL clock tLOW 4.7 - 1.3 - 0.5 - µs High period of the SCL clock tHIGH 4.0 - 0.6 - 0.26 - µs Set-up time for repeated START condition tSU;STA 4.7 - 0.6 - 0.26 - µs Data hold time tHD;DAT 0 3.45 0 0.9 0 0.45 µs Data set-up time tSU;DAT 250 - 100 - 50 - ns Set-up time for STOP condition tSU;STO 4.0 - 0.6 - 0.26 - µs Bus free time between a STOP and START condition tBUF 4.7 - 1.3 - 0.5 - µs (Note 4) STANDARD-MODE, FAST-MODE, and FAST-MODE PLUS (Fm+) 2-wire Serial Interface devices must be able to transmit or receive at the designated speed. The maximum bit transfer rates are 100 kbit/s for STANDARD-MODE devices, 400 kbit/s for FAST-MODE devices, and 1 Mbit/s for Fm+ devices.This transfer rates is based on the maximum transfer rate. For example the bus is able to drive 100 kbit/s clocks with Fm+. 2-wire Serial Interface Timing Figure 5. Serial Data Timing Figure 6. START and STOP Bit Timing Register Name Setting Item Description Initial Value R/W Read/Write Setting 0 = Write to serial registers, 1 = Read from serial registers 0 PS Serial Power Save 0 = Driver in standby mode, 1 = Driver in operating mode 0 EN Enable 0 = Output current set to zero & idling current set to zero, 1 = Constant current drive 0 W2W1W0 Register Address 000 = Don’t care 0x0 001 = Don’t care 010 = Target position DAC code [D9:D0] 011 = Reference DAC code [D7:D0] 100 = Actuator resonance frequency[D7:D3], Slew rate [D1:D0] 101 = ISRC setting – point A [D9:D0] 110 = ISRC setting – point B [D9:D0] 111 = Step resolution [D7:D5], Step time[D4:D0] M Mode Select Signal 0 = Direct mode, 1 = ISRC or Step mode 0 D9 to D0 10-bit Data Setting 10-bit data programmed to the corresponding register address 0x200 SCL tBUF SDA tHD : STA tSU : DAT tHD : DAT tHIGH tLOW SCL START BIT SDA STOP BIT tSU : STA tHD : STA tSU : STO |
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