THM3561 Datasheet, PDF (11/21 Pages) THine Electronics, Inc. – Stepping Motor Driver with LVDS Interface

THM3561_Rev1.01_E
3-wire CMOS Input and LVDS Input Initialization
In the case of using 3-wire CMOS and LVDS input, perform the initialization before writing in the register after
turning the power supply (VCC) on. If initialization is not performed, the first register writing (“1st Byte” to “Last
Byte”) may not be performed. Initialization is not needed if the first register writing is not required. In a case such as
this continually refresh all the registers (R00-R18).
For performing the initialization, the initialization of the 3-wire CMOS and LVDS input is performed for all the
devices that are connected in the post-stage, based on the input of pulse of Active-Low (pulse width: Min. 200ns) to
CSn at the initial stage 4-wire CMOS input.
In the case of a cascade connection, a transmission delay time of a few minutes of the cascade stage is needed for
completion of initialization of the 3-wire CMOS and LVDS.
VCC
CSn
Host ^SCK
SI
SCL
THM3561
SDA
SCL
THM3561
SDA
4-wire CMOS
Initialization Pattern (ex.1)
Low-active pulse input to the CSn pin.
Power supply VCC
3-wire CMOS or LVDS
1ms_Min. 200ns_Min.
CSn
(High)
4-wire CMOS input SCK
(High)
SI
3-wire CMOS output
or
LVDS output
SCL_OUT
SDA_OUT
Initialization Pattern (ex.2)
1^st Byte(Device Address) =FFh input
Power supply VCC
1ms_Min.
Initialization Pattern
CSn
4-wire CMOS input SCK
(High)
SI
3-wire CMOS output
or
LVDS output
SCL_OUT
SDA_OUT
76543210
76543210
Initialization Pattern
Figure 9. 3-wire CMOS Input and LVDS Input Initialization
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