Detailed description

STCF06

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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

SDA to select the desired I²C slave address (see Table 7)

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

7.4

Power-on reset

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

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

Table 7. Address table

ADD pin

A7

A6

A5

A4

A3

A2

A1

A0

GND

011000

0

R/W

VBAT

011000

1

R/W

SDA

011001

0

R/W

SCL

011001

1

R/W