ltc3220 Linear Technology Corporation, ltc3220 Datasheet - Page 7

• Manufacturer Part Number: ltc3220
• Description: 360ma Universal 18-channel Led Driver
• Manufacturer: Linear Technology Corporation

PIN FUNCTIONS
SDA (Pin 12): Input Data for the Serial Port. Serial data is
shifted in one bit per clock cycle to control the LTC3220/
LTC3220-1. The logic level is referenced to DV
C1P , C2P , C1M, C2M (Pins 27, 26, 23, 22): Charge Pump
Flying Capacitor Pins. A 2.2μF X7R or X5R ceramic ca-
pacitor should be connected from C1P to C1M and C2P
to C2M.
V
must be bypassed with a single 2.2μF low ESR ceramic
capacitor.
BLOCK DIAGRAM
IN
(Pin 24): Supply Voltage for the Entire Device. This pin
24
10
25
12
11
V
DV
RST
SDA
SCL
IN
CC
21
ULED18
20
ULED17
+
–
19
ULED16
CC
1.22V
SHIFT REGISTER
MASTER/SLAVE
OSCILLATOR
18
.
CONTROL
ULED15
850kHz
LOGIC
REG
17
ULED14
RST (Pin 25): Active Low Reset Input. RST Resets all
internal registers and forces LTC3220/LTC3220-1 into
shutdown mode.
CPO (Pin 28): Output of the Charge Pump. Used to power
all LEDs. A 4.7μF X5R or X7R ceramic capacitor should
be connected to ground.
Exposed Pad (Pin 29): Ground. The Exposed Pad must
be soldered to PCB ground.
16
ULED13
27
C1P
15
ULED12
CHARGE PUMP
23
CURRENT SOURCES
C1M
18 UNIVERSAL
AND DACS
14
ULED11
26
LTC3220/LTC3220-1
C2P
13
22
ULED10
C2M
18
9
ULED9
EXPOSED
ULED1
ULED2
ULED3
ULED4
ULED5
ULED6
ULED7
ULED8
PAD
CPO
3220 BD
29
28
1
2
3
4
5
6
7
8
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