NJU6052 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJU6052 Datasheet PDF : 23 Pages
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NJU6052
And, the formula (3) gives the PWM frequency.
f pwm
=
1
64
⋅
2
f osc
(3+ N
)
(Hz) --- Formula (3)
TABLE 7 PWM FREQUENCY
DIVIDE
N
00
0
01
1
10
2
11
3
100kHz
195.3
97.7
48.8
24.4
200kHz
390.6
195.3
97.7
48.8
FOSC
400kHz
781.3
390.6
195.3
97.7
800kHz
1562.5
781.3
390.6
195.3
UNIT : Hz
NOTE) PWM frequencies written in bold or neighbors are recommended, otherwise it might cause LED flickering.
(6) LEVEL SHIFTER
The level shifter allows the communication with the MPU working at the power supply voltage lower than the
VDD. Apply the MPU power-supply-voltage on the VDDL terminal. The voltage range is: 1.8V<VDDL<3.6V .
(7) RESET
By setting the RSTB pin to “L”, the NJU6052 is initialized into the following default status.
TABLE 8 RESET
REGISTER
REV
HOLD
STBY
BRIGHT
SOFF
DIVIDE
PWM REGISTER0-7
DATA
0
0
0
000
0
00
000000
Default status
Refer to Table 5
Sensor sampling is enabled
Standby Off
Luminance sensor control is enabled
PWM duty 0% (LED off)
(8) TEMPERATURE COMPENSATION
The reference voltage (VREF) generator has temperature compensation, which suppresses the characteristic
degradation of LEDs at high temperatures. Refer to “ILED vs. Temperature” shown in the “DC Electrical
Characteristics”.
- 10 -
Ver.2004-02-26
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