LTC3207/LTC3207-1
T = 25°C unless otherwise noted
A
TYPICAL PERFORMANCE CHARACTERISTICS
CAM Pin Dropout Voltage
vs CAM Pin Current
ULED Pin Current
vs ULED Pin Voltage
ULED Current vs Input Code
30
25
28
24
500
400
300
200
100
0
V
= 3.6V
BAT
V
BAT
= 3.6V
20
16
12
8
20
15
10
5
4
0
0
0.00
0.06
0.12
0.18
0.24
0.30
25
INPUT CODE (HEX)
37 3F
0
1
0A 13 1C
2E
50 100 150 200 250 300 350 400
ULED PIN VOLTAGE (V)
CAM PIN CURRENT (mA)
3207 G17
3207 G18
3207 G16
ULED Pin Dropout Voltage
vs ULED Pin Current
12-LED ULED Display Efficiency
CAM Efficiency vs V Voltage
vs V Voltage
BAT
BAT
180
160
140
120
100
80
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
V
BAT
= 3.6V
60
40
12 LEDS AT 15mA/LED
300mA LED CURRENT
20
(TYP V AT 15mA = 3.2V,
(TYP V AT 300mA = 3.6V,
F
F
NICHIA NSCW100)
AOT-2015HPW)
0
0
2
4
6
8 10 12
24 26 28
3.0
3.5
4.5
VOLTAGE (V)
5.0
5.5
3.0
3.5
4.5
VOLTAGE (V)
5.0
5.5
14 16 18 20 22
4.0
4.0
V
BAT
ULED PIN CURRENT (mA)
V
BAT
3207 G19
3207 G20
3207 G21
PIN FUNCTIONS
CPO (Pin 1): Output of the Charge Pump. Used to power
all LEDs. A 4.7µF X5R or X7R ceramic capacitor should
be connected to ground.
CAM (Pin 7): Current Source Output for the CAM Display
White LED. The LED on the CAM display can be set from
0mA to 425mA in 16 steps via software control and in-
ternal 4-bit linear DAC. Two 4-bit registers are available.
One is used to program the high camera current and the
second the low camera current. These registers can be
selected via the serial port or the CAMHL pin. The output
can be disabled by setting data in REG13 low. A safety
timer will disable the output after two seconds whenever
the high camera current mode is selected (see Applica-
tions Information).
ULED1-ULED12(Pins2-6,12-18):CurrentSourceOutputs
for Driving LEDs. The LED current can be set from 0mA
to 27.5mA in 64 steps via software control and internal
6-bit linear DAC. Each output can be disabled by setting
the associated data register REG1 to REG12 low. ULED1
to ULED12 can also be used as I C controlled open-drain
general purpose outputs. Connect unused outputs to
ground.
2
3207fc
6
Linear [ Linear ]
