NJU6052 Datasheet, PDF (8/23 Pages) New Japan Radio – White LED Driver with Automatic Dimming Control

NJU6052
(5-2) SENSOR DATA READ
The DATA terminal becomes output state by setting the REQ terminal to “1” after the command data
transmission. And the sensor data is read out, synchronizing with the SCK. The bit number corresponding to a
selected register is “1” and the others are “0”, as shown below.
FIGURE 3 SENSOR DATA READ (REV=0, PWM REGISTER4 selected)
REQ
SCK
DATA
B7
Command Data (Input)
01 2 3 4 5 6 7
Sensor Data (Output)
(5-3) SOFF and BRIGHT
By setting “1” at the SOFF bit, the luminance sensor control is disabled and the PWM duty is controlled by the
BRIGHT bits, as shown below.
TABLE 4 SOFF and BRIGHT
SOFF
BRIGHT
REV
0
-
0
000
001
010
1
011
100
-
101
110
111
PWM REGISTER
PWM REGISTER0
PWM REGISTER1
PWM REGISTER2
PWM REGISTER3
PWM REGISTER4
PWM REGISTER5
PWM REGISTER6
PWM REGISTER7
PWM REGISTER0
PWM REGISTER1
PWM REGISTER2
PWM REGISTER3
PWM REGISTER4
PWM REGISTER5
PWM REGISTER6
PWM REGISTER7
Note 1) When SOFF=”0”, luminance sensor control is enabled and PWM REGISTER is selected according to SENS voltage.
Note 2) For the information on the relation between SENS voltage and PWM REGISTER, refer to “DC ELECTRICAL
CHARACTERISTICS”.
(5-4) STBY
By setting “1” at the STBY bit, the NJU6052 goes into the standby mode, as follows.
- DC/DC converter, oscillator, reference voltage generator, and power supply for sensor are halted.
- The contents of PWM REGISTER are maintained.
- Luminance sensor control circuit is initialized.
-8-
Ver.2004-02-26