Datasheet

LT3745
15
3745f
Figure 2. Serial Data Frame Format
operaTion
Figure 3. Serial Data Input and Output Timing Chart
COMMAND REGISTER:
C1: ENABLE LED CHANNELS - ENABLE = 1, DISABLE = 0
C0: FRAME SELECT - GS FRAME = 0, DC FRAME = 1
STATUS REGISTER:
S0-S15: LED 0-15 FAULT - FAULT = 1, OK = 0
F0: OT - OVER TEMPERATURE = 1, OK = 0
194 BITS
GS
FRAME
GS 0, 12 BITS
DC 0, 6 BITSDC 15, 6 BITS
DC 0, 6 BITSDC 15, 6 BITS
3745 F02
GS 15, 12 BITS
LSB
LSB LSB
LSB
LSB
LSB
MSB MSB MSB MSB MSB MSB
C0C1
DC
FRAME
C0C1x x x x x x
S00 0 0 0 0S15
0 0 0 0 0
x x x x x x
STATUS
FRAME
F00
3746 F03
SCKI 186
1 186
INPUT DATA STATUS DATA
193 1 193192 194194
4096*T
PWMCK
193 192 193 194 1
C0 = 0C0 = 1C1
C0 = 1 F0C1
0x F0C1
C1
GS 0
LSB
C0 = 0 F0C1
GS 0
LSB
GS 15
MSB
GS 15
MSB
C1 F00
GS 0
LSB
GS 0
LSB + 1
GS 15
MSB
GS 15
MSB
DC 0
LSB
DC 0
LSB
DC 0
LSB + 1
DC 15
MSB
DC 15
MSB
194 11
SDI
LDI
SR[1]
LDO
SR[0]
SCKO
SDO/
SR[385]
t
WH-LDI
t
HD-LDI
t
SU-LDI
t
WH-CKI
t
WL-CKI
t
SU-SDI
t
HD-SDI
t
PD-LD↑
t
PD-LD↓
t
PD-SCK↑
t
PD-SCK↓
t
PD-SD
DC 15
MSB
DC 15
MSB
DC 15
MSB – 1
GS 15
MSB
DC 15
MSB
F00