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STCF06TBR

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I²C bus interface STCF06
22/35 Doc ID 14549 Rev 3
reading of the next register can start immediately without sending the device address and
the register address again. The last acknowledge pulse before the STOP bit is not required.
See the Figure 11.
Figure 11. Reading from multiple registers
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
ADDRESS OF
REGISTER i
A
C
K
M
S
B
L
S
B
S
T
A
R
T
A
C
K
R
/
W
R
E
A
D
DEVICE
ADDRESS
7 bits
DATA i
A
C
K
S
T
O
P
L
S
B
DATA i+1
A
C
K
L
S
B
DATA i+2
A
C
K
L
S
B
DATA i+2
L
S
B
DATA i+n
M
S
B
M
S
B
M
S
B
M
S
B
A
C
K
L
S
B
N
O
A
C
K
SDA LINE
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
ADDRESS OF
REGISTER i
A
C
K
M
S
B
L
S
B
S
T
A
R
T
A
C
K
R
/
W
R
E
A
D
DEVICE
ADDRESS
7 bits
DATA i
A
C
K
S
T
O
P
L
S
B
DATA i+1
A
C
K
L
S
B
DATA i+2
A
C
K
L
S
B
DATA i+2
L
S
B
DATA i+n
M
S
B
M
S
B
M
S
B
M
S
B
A
C
K
L
S
B
N
O
A
C
K
SDA LINE
Obsolete Product(s) - Obsolete Product(s)
STCF06 Description of internal registers
Doc ID 14549 Rev 3 23/35
9 Description of internal registers
9.1 PWR_ON
When set, it activates all analog and power internal blocks including the NTC supporting
circuit, and the device is ready to operate (ready mode). As long as PWR_ON=0, only the
I²C interface is active, minimizing Stand-by Mode power consumption.
9.2 TRIG_EN
This bit is AND-ed with the TRIG pin to generate the internal signal FL_ON that activates
flash mode. By this way, both soft-triggering and hard-triggering of the flash are made
possible. If soft-triggering (through I²C) is chosen, the TRIG pin is not used and must be
kept HIGH (VI). If hard-triggering is chosen, then the TRIG pin has to be connected to a
microprocessor I/O devoted to flash timing control, and the TRIG_EN bit must be set in
advance. Both triggering modes can benefit of the internal flash time counter, that uses the
TRIG_EN bit and can work either as a safety shut-down timer or as a flash duration timer.
flash mode can start only if PWR_ON=1. LED current is controlled by the value set by the
FDIM_0~3 of the DIM_REG.
9.3 TCH_ON
When set from Ready mode, the STCF06 enters the torch mode. The LED current is
controlled by the value set by the TDIM_0~3 of the DIM_REG.
Table 9. I²C register mapping function
Register name SUB ADDRESS (hex) Operation
CMD_REG 00 R / W
DIM_REG 01 R / W
AUX_REG 02 R / W
STAT_REG 03 R only
Table 10. Command register
CMD_REG
(write mode)
MSB LSB
SUB ADD=00 PWR_ON TRIG_EN TCH_ON NTC_ON FTIM_3 FTIM_2 FTIM_1 FTIM_0
Power-ON
RESET Value
0 0 000000
Obsolete Product(s) - Obsolete Product(s)
Description of internal registers STCF06
24/35 Doc ID 14549 Rev 3
9.4 NTC_ON
In ready mode, the comparators that monitor the LED temperature are activated if NTC_ON
bit is set. NTC-related blocks are always active regardless of this bit in torch mode and flash
mode.
9.5 FTIM_0~3
This 4-bits register defines the maximum flash duration. It is intended to limit the energy
dissipated by the LED to a maximum safe value or to leave to the STCF06 the control of the
flash duration during normal operation. Values from 0~15 correspond to 0 ~ 1.5 s (100 ms
steps). The timing accuracy is related to the internal oscillator frequency that clocks the
flash time counter (+/- 20 %). Entering flash mode (either by soft or hard triggering) activates
the flash time counter, which begins counting down from the value loaded in the F_TIM
register. When the counter reaches zero, flash mode is stopped by resetting TRIG_EN bit,
and simultaneously the ATN pin is set to true (LOW) to alert the microprocessor that the
maximum time has been reached. FTIM value remains unaltered at the end of the count.
9.6 TDIM_0~3
These 4 bits define the LED current in torch mode with 16 values fitting an exponential law.
Max torch current value is 25% of max flash current. (Figure 12)
9.7 FDIM_0~3
These 4 bits define the LED current in flash mode with 16 values fitting an exponential law.
The Max value of the current is set by the external resistors R
FL
and R
TR
. (Figure 12)
Table 11. Dimming register
DIM_REG
(write mode)
MSB LSB
SUB ADD=01 TDIM_3 TDIM_2 TDIM_1 TDIM_0 FDIM_3 FDIM_2 FDIM_1 FDIM_0
Power-ON, SHUTDOWN
MODE
RESET Value
00000000
Obsolete Product(s) - Obsolete Product(s)
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STCF06TBR

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Manufacturer:
STMicroelectronics
Description:
LED Lighting Drivers 1.5A WHITE LED DRVR
Lifecycle:
New from this manufacturer.
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