BU64987GWZ Datasheet, PDF (6/25 Pages) Rohm – Bi-directional VCM driver for Auto focus

BU64987GWZ
Register
Name
R/W
PS
EN
W2W1W0
M
D9 to D0
Setting
Item
Read/Write
Setting
Serial
Power
Save
Enable
Register
Address
Mode
Select
Signal
10-bit Data
Setting
Description
0 = Write to serial registers, 1 = Read from serial registers
0 = Driver in standby mode, 1 = Driver in operating mode
0 = Output current set to zero & idling current set to zero,
1 = Constant current drive
000 = Don’t care
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]
0 = Direct mode, 1 = ISRC or Step mode
10-bit data programmed to the corresponding register address
Initial
Value
0
0
0
0x0
0
0x200
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)}
Min
Max
FAST-MODE^{(Note 4)}
Min
Max
Fm+^{(Note 4)}
Min
Max
Unit
Hysterics of Schmitt trigger inputs
Vhys
-
Pulse width of spikes which must be suppressed
by the input filter
tSP
0
Hold time (repeated) START condition. After this
period, the first clock pulse is generated
tHD;STA
4.0
LOW period of the SCL clock
tLOW
4.7
-
0.05VDD - 0.05VDD
-
V
50
0
50
0
50
ns
-
0.6
-
0.26
-
µs
-
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
SCL
SDA
tHD : STA
tBUF
tSU : DAT
tLOW
tHIGH
tHD : DAT
SCL
SDA
tSU : STA
tHD : STA
tSU : STO
START BIT
STOP BIT
Figure 5. Serial Data Timing
Figure 6. START and STOP Bit Timing
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
6/21
TSZ02201-0K1K0B601860-1-2
6. Oct.2016 Rev.001