STCF06 Datasheet, PDF (14/33 Pages) STMicroelectronics – 1.5 A white LED driver with I²C interface

Detailed description
STCF06
besides, automatically resets the ATN pin. The STAT_REG bits affecting the ATN pin status
are mapped in Table 15. No internal pull-up is provided.
7.3.4
ADD pin
With this pin it is possible to select one of the 4 possible I²C slave addresses. No internal
pull-up nor pull-down is provided. The pin has to be connected to either GND, V_I,SCL or
SDA to select the desired I²C slave address (see Table 7)
Table 7. Address table
ADD pin
A7
A6
A5
A4
A3
A2
A1
A0
GND
0
1
1
0
0
0
0
R/W
VBAT
0
1
1
0
0
0
1
R/W
SDA
0
1
1
0
0
1
0
R/W
SCL
0
1
1
0
0
1
1
R/W
7.3.5
TMSK pin
This pin can be used to implement the TX masking function. This function has effect only for
flash current settings higher than 370 mA (bit FDIM=7hex). Under this condition, when this
pin is pulled high by the µP, the current flowing in the LED is forced at 370 mA typ. No
internal pull-up or pull-down is provided; to be externally wired to GND if TX masking
function is not used. The value corresponds to R_FL resistor 0.15 ohm.
7.4
Power-on reset
This mode is initiated by applying a supply voltage above the V_{PW_ON RESET} threshold
value. An internal timing (~1 µs) defines the duration of this status. The logic blocks are
powered, but the device doesn't respond to any input. The registers are reset to their default
values, the ATN and SDA pins are in high-Z, and the I²C slave address is internally set by
reading the ADD pin configuration. After the internally defined time has elapsed, the
STCF06 automatically enters the Stand-by mode.
7.5
Shutdown, shutdown with NTC
In this mode only the I²C interface is alive, accepting I²C commands and register settings.
The device enters this mode: automatically from power-on reset status; by resetting the
PWR_ON bit from other operation modes. Power consumption is at the minimum (1 µA max)
if NTC is not activated (NTC_ON=0). If PWR_ON and NTC_ON is set, the T1 is switched
ON (see Figure 1), allowing the µP to measure the LED temperature through its A/D
converter.
7.6
14/33
Ready mode
In this mode all internal blocks are turned ON, but the DC-DC converter is disabled and the
White LED is disconnected. The NTC circuit can be activated to monitor the temperature of
the LED and I²C commands and register settings are allowed to be executed immediately.
Only in this mode the auxiliary LED is operational and can be turned ON and set at the
desired brightness using the AUX REGISTER. The device enters this mode: from Stand-by