MAX16806 Maxim Integrated Products, MAX16806 Datasheet - Page 14

• Manufacturer Part Number: MAX16806
• Description: (MAX16805 / MAX16806) EEPROM-Programmable
• Manufacturer: Maxim Integrated Products

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The Binning Adjustment register is a 4-bit register that
sets the differential regulation voltage reference
between CS+ and CS-. Only the first 4 bits of the data
byte update the Binning Adjustment register. The
remaining 4 bits are ignored. See
default register value is 198mV.
The Ramp Peak register is a 3-bit register that sets the
maximum peak value of an internally 200Hz generated
ramp. The ramp signal can be programmed for a peak
value of 1.55V to 2.88V. Only the first 3 bits of the data
byte update the Ramp Peak register. The remaining 5
bits are ignored (see
ister value is 2.88V.
EEPROM-Programmable, High-Voltage, 350mA
LED Drivers with LED Current Foldback
Table
14
VOLTAGE (mV)
4
REGULATION
Ramp Peak Register (0x01), MAX16806
______________________________________________________________________________________
103.0
109.0
115.4
121.8
128.2
134.6
141.0
147.4
153.7
160.1
166.5
173.0
179.3
185.7
192.1
198.0
3. Binning Adjustment
Binning Adjustment Register (0x00)
BIT 3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Table
BIT 2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
4). The factory-default reg-
BIT 1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Table
BIT 0
3. The factory-
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
(0x0C)
(0x0D)
(0x00)
(0x01)
(0x02)
(0x03)
(0x04)
(0x05)
(0x06)
(0x07)
(0x08)
(0x09)
(0x0A)
(0x0B)
(0x0E)
(0x0F)
HEX
LED_CFT is a 4-bit register that sets the threshold for
the onset of the LED current foldback operation. Only
the first 3 bits of the data byte program the LED_CFT
register. Bit 3, not shown in
rent foldback range.
The MAX16805/MAX16806 start dimming the LED cur-
rent when the input voltage exceeds the LED current
foldback threshold. For bit 3 = 0, the dimming range is
1.2 times the programmed ramp peak voltage. For bit 3
= 1, the dimming range is 2.4 times the programmed
ramp peak. To disable the LED current foldback feature
of the MAX16805/MAX16806 connect CFT to GND. The
factory-default register value is 16V.
Table
Table
THRESHOLD (V)
RAMP END
POINT (V)
FOLDBACK
CURRENT
1.55
1.74
1.93
2.12
2.32
2.51
2.70
2.88
16.4
15.7
15.0
14.3
13.5
12.8
12.1
11.4
4. Ramp Peak Value
5. LED Current Foldback Threshold
LED Current Foldback Threshold
BIT 2
0
0
0
0
1
1
1
1
(LED_CFT) Register (0x02)
BIT 2
0
0
0
0
1
1
1
1
BIT 1
Table
0
0
1
1
0
0
1
1
BIT 1
0
0
1
1
0
0
1
1
5, sets the LED cur-
BIT 0
0
1
0
1
0
1
0
1
BIT 0
0
1
0
1
0
1
0
1
(0x00)
(0x01)
(0x02)
(0x03)
(0x04)
(0x05)
(0x06)
(0x07)
HEX
(0x00)
(0x01)
(0x02)
(0x03)
(0x04)
(0x05)
(0x06)
(0x07)
HEX