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CAT3636
Register Configuration and Programming
Table 6. REGISTER ADDRESS AND DATA
Address
DATA Pattern
Register
REG1
Pulses
1
Description
Bank Enable and IMODE
Bits
4
Bit 3
IMODE
Bit 2
ENA
Bit 1
ENB
Bit 0
ENC
REG2
2
Global Current Setting
4
REG3
REG4
REG5
REG6
3
4
5
6
Bank A Current Setting
Bank B Current Setting
Bank C Current Setting
Return Lockout
4
4
4
1
See Table 8 for values
RTLKO
Register REG1 allows to set the mode and select the pairs
of LEDs to be turned on. A low LED current mode exists to
allow for very low current operation under 4 mA per
channel. If IMODE equals 1, the high current range is
selected up to 32 mA. If IMODE is set to 0, all currents are
Table 8. REG2 ? 5 CURRENT SETTING REGISTERS
Data REGx Value LED Current LED Current
Pulses (binary) IMODE = 0 IMODE = 1
0 0000 0.0 mA 2 mA
Data
REG1 Value
divided by 8. Each bank of LEDs (A, B or C) can be turned
on independently by setting the respective bit ENA, ENB,
ENC to 1, as shown in Table 7. For example, to enable all 6
LEDs in low current mode, REG1 is programmed to 0111
binary (9 data pulses).
Table 7. REG1 REGISTER SETTING
Bank Enable
Pulses (binary) IMODE ENA ENB ENC
0 0000 0 ? ? ?
1
2
3
4
5
6
7
8
9
1111
1110
1101
1100
1011
1010
1001
1000
0111
3.75 mA
3.5 mA
3.25 mA
3 mA
2.75 mA
2.5 mA
2.25 mA
2 mA
1.75 mA
32 mA
30 mA
28 mA
26 mA
24 mA
22 mA
20 mA
18 mA
16 mA
1
2
3
4
5
6
7
1111
1110
1101
1100
1011
1010
1001
1
1
1
1
1
1
1
On
On
On
On
?
?
?
On
On
?
?
On
On
?
On
?
On
?
On
?
On
10
11
12
13
14
15
16
0110
0101
0100
0011
0010
0001
0000
1.5 mA
1.25 mA
1 mA
0.75 mA
0.5 mA
0.25 mA
0.0 mA
14 mA
12 mA
10 mA
8 mA
6 mA
4 mA
2 mA
8
9
10
11
12
13
14
15
16
1000
0111
0110
0101
0100
0011
0010
0001
0000
1
0
0
0
0
0
0
0
0
?
On
On
On
On
?
?
?
?
?
On
On
?
?
On
On
?
?
?
On
?
On
?
On
?
On
?
REG6 contains the return lockout (RTLKO) bit. This
stops the charge pump returning to 1x mode. One pulse sets
it to 1. Two pulses or no pulses set RTLKO to 0. When
RTLKO is set to 1, the charge pump cannot automatically
return to 1x mode when in one of the charge pump modes.
The device can however move from 1x to 1.33x to 1.5x to
2x if the input voltage is not sufficient to drive the
programmed LED currents.
REG6 also triggers a charge pump reset as soon as it is
addressed. This forces the charge pump to start from 1x
mode and reassess the correct mode it should be in to drive
Register REG2 allows to set the same current for all 6
channels. REG3, REG4, REG5 allow to set the current
respectively in banks A, B and C. The three banks can be
programmed with independent current values.
the LEDs most efficiently. If the input voltage has risen or
the device has been reprogrammed to other LED values, it
is recommended to trigger this reset allowing the charge
pump to run in the most efficient mode.
The CAT3636 enters a “zero current” shutdown mode if
EN/SET is held low for 1.5 ms or more. All registers are
reset back to zero when the device is placed in shutdown.
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