LV8414CS Datasheet, PDF (9/36 Pages) Sanyo Semicon Device – Microstep Driver Motor Driver IC

LV8414CS
Data transfer write format
The slave address and Write command must be allocated to the first byte (8 bits) and the register address in the “Serial
data truth table” must be designated in the second byte.
For the third byte, data transfer is carried out to the address designated by the register address which is written in the
second byte. Subsequently, if data continues, the register address value is automatically incremented for the fourth and
subsequent bytes.
Thus, continuous data transfer starting at the designated address is made possible.
When the register address is set to “00000011,” the address to which the next byte is transferred wraps around to
"00000000."
(1) Data write example
S11100100A00000001A
Data 1
A
Slave address
Register address set
(00000001)
R/W = 0 written
Write data to register address
00000001
Data 2
A
Data 3
A
Data 4
AP
Write data to register address
00000010
Write data to register address
00000011
Write data to register address
00000000
S Start condition
P Stop condition
A Acknowledge
Master side transmission
Slave side transmission
(2) Actual example of continuous data transfer
Start
M
S
B
Slave
address
L AM
SWC S
B KB
Register
address
LAM
SC S
BK B
Data
LAM
SC S
BK B
Data
LAM
SC S
BK B
Data
LAM
SC S
BK B
Data
L
S
A
C
Stop
BK
SCL
SDA
A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
11100100 00000001 11000000 01010000 00000000 11001000
3/4-channel
• Output on
• Reset release
• Forward rotation
• Current reference
voltage 0.2V
1/2-channel
• CLK1 frequency
division
• 1-2 phase setting
3/4-channel
• CLK2 frequency
division
• 1-2 phase setting
• 400kHz chopping
• photo sensor OFF
• MO output
channels set to 1/2
channels
• MO output Initial
position
1/2-channel
• Output on
• Reset release
• Reverse rotation
• Current reference
voltage 0.2V
Based on the “Serial data truth table” on the next page, the following settings are used for the actual example of the
continuous data transfer shown in the above figure.
(Data transfer is set at the SCL rising edge of “D0” of each data.)
1/2-channel settings:
Output ON, reset release, reverse (CCW) rotation, current reference voltage setting of 0.2V, no CLK1 frequency
division, 1-2 phase setting
3/4-channel settings:
Output ON, reset release, forward (CW) rotation, current reference voltage setting of 0.2V, no CLK2 frequency
division, 1-2 phase setting
Other settings:
400kHz chopping frequency, photo sensor OFF, MO output channels set to 1/2 channels, current reference voltage
setting of 0.2V
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