LM3538

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SNVS674A – JUNE 2011 – REVISED MAY 2013

PIN DESCRIPTIONS

Bump

Name

Description

C5

VIN_A

Input voltage for LED driver and sensor interface. Input range: 2.7V to 5.5V.

E5

VIN_B

Input voltage for the regulators. This must be connected to the same voltage supply as

VIN_A

F5

VIN_C

Input voltage (power rail) for the LDO regulators. 1.8V

≤ VIN_C ≤ VIN_A

B1

SCL

Serial interface clock

B3

SDA

Serial interface data

A1

HWEN

Hardware enable pin. High = normal operation, low = RESET

B2

PWM

External PWM Input - Allows the current sinks to be turned on and off at a frequency and

duty cycle externally controlled. Minimum on-time pulse width = 15µsec.

E4

SBIAS

Power supply for a light sensor. Leave unconnected if not used.

E3

GPO1

General purpose output. Can be used as a sensor gain control signal. When functioning

as a general purpose output, it is open drain and requires an external pullup. Leave

unconnected if not used.

E2

GPO2

General purpose output. Can be used as a sensor gain control signal. When functioning

as a general purpose output, it is open drain and requires an external pullup. Leave

unconnected if not used.

D5

ALS

Ambient Light Sensor input. Connect to ground if not used.

F3

GND

Regulator ground

A2

PGND

LED driver and charge pump ground

F2

LDO4

Programmable VOUT of 1.2-3.3 V. Max load = 150mA.

F4

LDO3

Programmable VOUT of 1.2-3.3 V. Max load = 150mA.

E1

LDO2

Programmable VOUT of 1.2-3.3 V. Max load = 150mA.

F1

LDO1

Programmable VOUT of 1.2-3.3 V. Max load = 300mA.

C3

NC

Not Connected, keep floating.

C4

INT

ALS interrupt. A pullup resistor is required. A '0’ means a change has occurred, while a ‘1’

means no ALS adjustment has been made.

D4

D6

LED driver

D3

D5

LED driver

D2

D4

LED driver

D1

D3

LED driver

C1

D2

LED driver

C2

D1

LED driver

B5

VOUT

Charge pump output

B4

C2-

Flying capacitor 2 negative terminal

A4

C2+

Flying capacitor 2 positive terminal

A3

C1-

Flying capacitor 1 negative terminal

A5

C1+

Flying capacitor 1 positive terminal

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

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