THL3512 Datasheet, PDF (12/16 Pages) THine Electronics, Inc. – The THL3512 is an LED driver with 24 channel opendrain

THL3512_Rev.1.02_E
Initialization of 2-pair Serial LVDS Input
After power-up, if using 2-pair serial LVDS input, initialization of 2-pair serial LVDS input must be done before writing
to registers. Without the initialization of 2-pair serial LVDS input, the first writing to registers (“1st Byte”-”Last Byte”)
may possibly fail. However, the initialization of 2-pair serial LVDS input is not necessary in case failure in the first writ-
ing to registers can be allowed; for example, in case all the registers (R00-R18) are continuously rewritten, in other
words repeatedly refreshed.
In order to initialize 2-pair serial LVDS input, please input active-low pulse (pulse width: 200ns min.) of the CSn into 3-
wire serial CMOS level input of the first device which converts 3-wire to 2-pair. In consequence, the 2-pair serial LVDS
input of all the following devices are initialized. In cascading connection, it takes the propagation delay of all stages in
cascaded chain to finish the initialization of 2-pair serial LVDS input.
Host
3-wire serial
CSn
SCK
SI
2-pair serial LVDS
2-pair serial LVDS
SCL
THL35XX
THL35XX
SDA
Active-low pulse input
2-pair serial LVDS inputs to be initialized
< Initialization of 2-pair Serial LVDS Input >
Initialization Pattern Example 1
Input active-low pulse input to the CSn
3-wire serial
CMOS level input
SCL_INn (CSn)
SCL_INp (SCK) (High)
Min.200ns
SDA_INp (SI)
(High)
2-pair serial
LVDS Output
SCL_OUT
SDA_OUT
Initialization Pattern Example 2
Input 1st Byte (Device Address)=FFh
SCL_INn (CSn)
3-wire serial
CMOS level input
SCL_INp (SCK)
Initialization Pattern
76543210
2-pair serial
LVDS Output
SDA_INp (SI)
SCL_OUT
SDA_OUT
(High)
76543210
Initialization Pattern
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