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CAT3626HV4-GT2

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
CAT3626
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10
Block Diagram
Mode Control
1 MHz
Oscillator
Current
Setting DAC
Serial
Interface
Registers
Reference
Voltage
1x mode (LDO)
1.5x Charge Pump
1 mF 1 mF
1 mF1 mF
EN
LEDA1
LEDA2
LEDB1
LEDB2
LEDC1
LEDC2
GND
6 Current
Sink Regulators
SDA
SCL
Figure 25. CAT3626 Functional Block Diagram
V
OUT
C
OUT
C
IN
V
IN
C
2+
C
2−
C
1−
C
1+
Basic Operation
At power−up, the CAT3626 starts operating in 1x mode
where the output will be approximately equal to the input
supply voltage (less any internal voltage losses). If the
output voltage is sufficient to regulate all LEDs currents the
device remains in 1x operating mode.
If the input voltage is insufficient or falls to a level where
the regulated currents cannot be maintained, the device
automatically switches (after a fixed time of 400 ms) into
1.5x mode.
In 1.5x mode, the output is approximately equal to 1.5
times the input supply voltage (less any internal voltage
losses).
The above sequence is repeated each and every time the
chip is either powered−up or taken out of shutdown (via
EN pin), or the RegEn register is accessed by write cycle.
LED Current Setting
The LED current setting is programmed via the I
2
C serial
interface and is stored in four 8−bit registers RegA, RegB,
RegC and RegEn as follows:
• RegA stores the LED current for group A (LEDA1 and
LEDA2 channels),
• RegB stores the LED current for group B (LEDB1 and
LEDB2 channels),
• RegC stores the LED current for group C (LEDC1 and
LEDC2 channels),
• RegEn selects the on/off state of each of the 6 LED
channels.
At each write access to RegEn, the driver automatically
reconfigures to the mode (1x or 1.5x) that provides the
highest efficiency.
Table 6. REGISTER ADDRESS AND DATA CONFIGURATION (Note 3)
Register
Name
Register
Address
Bit Pattern
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
RegA 0 X X
See Table 7 for values
RegB 1 X X
RegC 2 X X
RegEn 3 X X
LEDC2
On = 1
Off = 0
LEDC1
On = 1
Off = 0
LEDB2
On = 1
Off = 0
LEDB1
On = 1
Off = 0
LEDA2
On = 1
Off = 0
LEDA1
On = 1
Off = 0
3. X = not used, 1 = logic high, 0 = logic low
CAT3626
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11
The Table 7 lists the various LED currents with the associated RegA, RegB, and RegC register values.
Table 7. LED CURRENT SELECTION AND REGISTER VALUE (Note 4)
LED
Current
(mA)
D7 D6 D5 D4 D3 D2 D1 D0 Dec
0.5 X X 0 0 0 0 0 0 0
1.0 X X 0 0 0 0 0 1 1
1.5 X X 0 0 0 0 1 0 2
2.0 X X 0 0 0 0 1 1 3
2.5 X X 0 0 0 1 0 0 4
3.0 X X 0 0 0 1 0 1 5
3.5 X X 0 0 0 1 1 0 6
4.0 X X 0 0 0 1 1 1 7
4.5 X X 0 0 1 0 0 0 8
5.0 X X 0 0 1 0 0 1 9
5.5 X X 0 0 1 0 1 0 10
6.0 X X 0 0 1 0 1 1 11
6.5 X X 0 0 1 1 0 0 12
7.0 X X 0 0 1 1 0 1 13
7.5 X X 0 0 1 1 1 0 14
8.0 X X 0 0 1 1 1 1 15
8.5 X X 0 1 0 0 0 0 16
9.0 X X 0 1 0 0 0 1 17
9.5 X X 0 1 0 0 1 0 18
10.0 X X 0 1 0 0 1 1 19
10.5 X X 0 1 0 1 0 0 20
11.0 X X 0 1 0 1 0 1 21
11.5 X X 0 1 0 1 1 0 22
12.0 X X 0 1 0 1 1 1 23
12.5 X X 0 1 1 0 0 0 24
13.0 X X 0 1 1 0 0 1 25
13.5 X X 0 1 1 0 1 0 26
14.0 X X 0 1 1 0 1 1 27
14.5 X X 0 1 1 1 0 0 28
15.0 X X 0 1 1 1 0 1 29
15.5 X X 0 1 1 1 1 0 30
16.0 X X 0 1 1 1 1 1 31
LED
Current
(mA)
D7 D6 D5 D4 D3 D2 D1 D0 Dec
16.5 X X 1 0 0 0 0 0 32
17.0 X X 1 0 0 0 0 1 33
17.5 X X 1 0 0 0 1 0 34
18.0 X X 1 0 0 0 1 1 35
18.5 X X 1 0 0 1 0 0 36
19.0 X X 1 0 0 1 0 1 37
19.5 X X 1 0 0 1 1 0 38
20.0 X X 1 0 0 1 1 1 39
20.5 X X 1 0 1 0 0 0 40
21.0 X X 1 0 1 0 0 1 41
21.5 X X 1 0 1 0 1 0 42
22.0 X X 1 0 1 0 1 1 43
22.5 X X 1 0 1 1 0 0 44
23.0 X X 1 0 1 1 0 1 45
23.5 X X 1 0 1 1 1 0 46
24.0 X X 1 0 1 1 1 1 47
24.5 X X 1 1 0 0 0 0 48
25.0 X X 1 1 0 0 0 1 49
25.5 X X 1 1 0 0 1 0 50
26.0 X X 1 1 0 0 1 1 51
26.5 X X 1 1 0 1 0 0 52
27.0 X X 1 1 0 1 0 1 53
27.5 X X 1 1 0 1 1 0 54
28.0 X X 1 1 0 1 1 1 55
28.5 X X 1 1 1 0 0 0 56
29.0 X X 1 1 1 0 0 1 57
29.5 X X 1 1 1 0 1 0 58
30.0 X X 1 1 1 0 1 1 59
30.5 X X 1 1 1 1 0 0 60
31.0 X X 1 1 1 1 0 1 61
31.5 X X 1 1 1 1 1 0 62
32.0 X X 1 1 1 1 1 1 63
4. X = not used, 1 = logic high, 0 = logic low
CAT3626
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12
I
2
C Interface
The LED driver is interfaced through a 2−wire serial
I
2
C−bus in order to control the state and the current in each
of the six LED channels. The SDA and SCL lines comply
with the I
2
C electrical specification and should be
terminated with pull−up resistors. When the bus is not used,
both lines are high. The device supports the maximum bus
speed of 400 kbit/s. The serial bit sequence is shown below
for read and write operations into the registers. Read and
write instructions are initiated by the master controller/CPU
and acknowledged by the slave LED driver. The I
2
C address
of the driver is internally fixed to the binary value 1100110.
The protocol requires that the start bit and the device address
are both repeated. For further details on the I
2
C protocol,
please refer to the I
2
C−Bus Specification, document number
9398 393 40011, from Philips Semiconductors.
• Read operation:
S Slave address W A Register address A S Slave address R A Data A* P
• Write operation:
S Slave address W A Register address A Data A P
S: Start condition
R, W: Read bit (1), Write bit (0)
A: Acknowledge sent by the slave LED driver (SDA high)
A*: Not Acknowledge sent by the master microcontroller (SDA low)
P: Stop condition
Slave address: Device address 7 bits (MSB first, slave address is 1100110).
Register address: Device register address 8 bits
Data: Data to read or write 8 bits
Figure 26. Write Instruction Sequence
Figure 27. Write Instruction Example Setting 20 mA Current in LEDB1 and LEDB2
SDA
SCL
START
Condition
ADDRESS
1−789 89 891−71−7
ADDRESSR/W ACK ACKACK DATA
STOP
Condition
Figure 28. I
2
C Bus Protocol
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

CAT3626HV4-GT2

Mfr. #:
Buy CAT3626HV4-GT2
Manufacturer:
ON Semiconductor
Description:
LED Lighting Drivers LED DR CH PUMP 6 CH I2C
Lifecycle:
New from this manufacturer.
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