LTC3210EPD-1-TRPBF datasheet(7/16 Pages) LINER

7 / 16 page

LTC3210-1

32101fc

C1P, C2P, C1M, C2M (Pins 1, 16, 14, 13): 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.

CPO (Pin 2): Output of the Charge Pump Used to Power

All LEDs. This pin is enabled or disabled using the ENM

and ENC inputs. A 2.2μF X5R or X7R ceramic capacitor

should be connected to ground.

ENM, ENC (Pins 3, 10): Inputs. The ENM and ENC pins

are used to program the LED output currents. The ENC

pin is strobed up to 7 times to decrement the internal 3-bit

DAC’s from full-scale to 1LSB. The ENM pin is strobed 63

times to decrement the 6-bit DAC from full-scale to 1LSB.

The counters will stop at 1LSB if the strobing continues.

The pin must be held high after the ﬁnal desired positive

strobe edge and the data is transferred after a 150μs (typ)

delay. Holding the ENM or ENC pin low will clear the counter

for the selected display and reset the LED current to 0.

If both inputs are held low for longer than 150μs (typ)

the part will go into shutdown. The charge pump mode

is reset to 1x whenever ENC goes low or when the part

is shut down.

MLED1, MLED2, MLED3, MLED4 (Pins 4, 5, 6, 7):

Outputs. MLED1 to MLED4 are the MAIN current source

outputs. The LEDs are connected between CPO (anodes)

and MLED1-4 (cathodes). The current to each LED output

is set via the ENM input, and the programming resistor

connected between RM and GND. Each of the four LED

outputs can be disabled by connecting the output directly

to CPO. A 10μA current will ﬂow through each directly

connected LED output.

RM, RC (Pins 8,9): LED Current Programming Resistor

Pins. The RM and RC pins will servo to 1.22V. Resistors

connected between each of these pins and GND are used

to set the high and low LED current levels. Connecting

a resistor 12k or less will cause the LTC3210-1 to enter

overcurrent shutdown.

CLED (Pin 11): Output. CLED is the CAM current source

output. The LED is connected between CPO (anode) and

CLED (cathode). The current to the LED output is set via

the ENC input, and the programming resistor connected

between RC and GND.

GND (Pin 12): Ground. This pin should be connected to

a low impedance ground plane.

VBAT (Pin 15): Supply voltage. This pin should be bypassed

with a 2.2μF, or greater low ESR ceramic capacitor.

Exposed Pad (Pin 17): This pad should be connected

directly to a low impedance ground plane for optimal

thermal and electrical performance.

PIN FUNCTIONS

LTC3210EPD-1-TRPBF Datasheet(PDF) 7 Page - Linear Technology

LTC3210EPD-1-TRPBF Datasheet(HTML) 7 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Datasheet Download

Link URL