ncp1840 ON Semiconductor, ncp1840 Datasheet - Page 7

• Manufacturer Part Number: ncp1840
• Description: High Current, 8-output Led Driver
• Manufacturer: ON Semiconductor

Y7.937 ms in a period of 500 ms. Code 62
Finally a code 63
NOTE: Any unused ULED output should not be turned “ON”.
SERIAL INTERFACE TIMING INFORMATION
OVER TEMPERATURE SHUTDOWN
is detected, all LED outputs and the Charge Pump will be turned off and bit DATA0 on register 17
This register can be read through the serial interface. If the over temperature condition goes away, the bit DATA0 on register
17
temperature shutdown is 130°C to 163°C.
0
1
SCL clock frequency
Hold time for Start condition
LOW Period of SCL Clock
High Period of SCL Clock
Setup time for Start condition
Data hold time
Data setup time
Rise time
Fall time
Setup time for Stop condition
Time between Stop and Start
Capacitive load for each bus line
The initial target for LED period is ~2 kHz – If this period is used, a PWM code 1
The Over Temperature Shutdown circuit will detect an over temperature condition in the chip. Once the over temperature
dec
3. ULED1−8 OUTPUT CONTROL REGISTER
4. MAIN STATUS REGISTER
DATA7
0
0
will be automatically reset to a logic zero and the part will resume normal operation. The target trip point for the over
ULED8 on
ULED8 off
DATA7
DATA6
dec
0
0
would have an “ON” duty cycle equal to 500 ms in a period of 500 ms or continuously “ON”.
ULED7 on
ULED7 off
DATA6
Parameter
DATA5
0
0
ULED6 off
ULED6 on
DATA5
DATA4
dec
0
0
would have an “ON” duty cycle equal to 492.0635 ms for a period of 500 ms.
ULED5 off
ULED5 on
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DATA4
DATA3
Figure 4.
0
0
7
0 = Normal Operation
1 = Low Power Mode
ULED4 off
ULED4 on
DATA3
Symbol
DATA2
t
t
t
t
t
SU;STO
HD;STA
SU;STA
HD:DAT
SU;DAT
t
t
f
t
HIGH
LOW
SCL
BUF
C
t
t
r
f
L
ULED3 off
ULED3 on
DATA2
dec
Min
100
0.6
1.3
0.6
0.6
0.6
1.3
10
10
−
would give an “ON” duty cycle of
DATA1
0
0
ULED2 off
ULED2 on
dec
DATA1
will be set to logic one.
1 = Over Temperature
0 = Normal Operation
Max
400
300
300
200
0.9
DATA0
ULED1 on
ULED1 off
DATA0
Unit
kHz
mS
mS
mS
mS
mS
mS
nS
nS
mS
mS
pF