bq500511

SLUSCD3A – AUGUST 2015 – REVISED OCTOBER 2015

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Pin Functions (continued)

PIN

I/O

DESCRIPTION

NAME

NO.

ISENSE

3

I

Input current sense.

LED_A

11

O

Connect to a LED via 1-k

Ω resistor for status indication. Typically GREEN.

LED_B

12

O

Connect to a LED via 1-k

Ω resistor for status indication. Typically RED.

LED_C

14

O

Connect to a LED via 1-k

Ω resistor for status indication. Typically ORANGE.

LED_MODE

34

I

LED mode selection.

MODE is an output intended for use by the bq50002 Analog Front End indicating whether adjustments

MODE

16

O

should be made using frequency (when MODE is low) or duty-cycle (when MODE is high).

If PWM_CTRL is high, this pin outputs PWM1 signal. If PWM_CTRL is low, this pin outputs clock signal.

PWM1 /

1

O

The rising edge of the clock is used to adjust frequency (MODE low) or duty cycle (MODE high) output of

CLK_OUT

the bq50002 Analog Front End.

PWM_CTRL is an output intended for use by the bq50002 Analog Front End to select whether its PWM

PWM_CTRL

38

O

outputs are generated internally within the bq50002 itself (PWM_CTRL HIGH), or whether they are simply

passed through from external signals (PWM_CTRL LOW).

If PWM_CTRL is high, this pin outputs PWM2 signal. If PWM_CTRL is low, this pin is used to adjust the

PWM2 /

frequency (MODE low) or duty cycle (MODE high) of the external PWM output. If this signal is high, it

2

O

UP_DOWN

decrease frequency or increase duty cycle. If this signal is low, it increases frequency or decreases duty

cycle output of the bq50002 Analog Front End.

Reserved

4

I

Leave this pin open.

Reserved

5

I

Unused

Reserved

19

I

Reserved. Leave this pin open.

Reserved

20

I/O

Reserved. Leave this pin open.

SCL

29

I/O

10-k

SDA

28

I/O

10-k

TSENSE

13

I

Temperature sensing for safety shutdown. Connect to 3 V via 10-k

Ω resistor if unused.

Unused

6

I

Leave this pin open.

Unused

7

I/O

Leave this pin open.

17, 18,

Unused

I/O

Leave this pin open.

24–27

VCORE

30

—

Regulated internal core power supply. Connect via 0.4-µF capacitor to ground.

VPEAK

8

I

Peak coil voltage.

VSENSE

9

I

Input voltage sense.

4

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