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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

TCA6507

WITH INTENSITY CONTROL AND SHUTDOWN

SCPS164B – MAY 2007 – REVISED NOVEMBER 2007

ORDERING INFORMATION

ORDERABLE PART NUMBER

TOP-SIDE MARKING

BGA – ZXU (Pb-free)

Reel of 2500

TCA6507ZXUR

PH507

–40

°C to 85°C

QFN – RUE

Reel of 3000

TCA6507RUER

2M

TSSOP – PW

Reel of 2000

TCA6507PWR

PH507

(1)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

(2)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com.

This device can be used for driving LEDs and for general-purpose parallel output expansion. The TCA6507 has

three Select registers (Select0, Select1 and Select2), which can be used to configure each LED output into one

of seven different operating modes. At power on, the outputs are in high impedance.

When used to drive LEDs, the seven outputs can be configured into two banks of outputs (BANK0 and BANK1).

dimming and blink rates are fully programmable. The intensity of each bank of LEDs is controlled by dynamically

varying the duty cycle of the signal, which has a period of approximately 8 ms and a pulse rate of 125 times per

second, driving the outputs. The TCA6507 has two independent dimming/blinking modules—PWM0 and

PWM1—driven by a single internal oscillator that supports these features. PWM0 determines the characteristics

of BANK0 and PWM1 determines the characteristics of BANK1.

The TCA6507 has a master intensity level known as the ambient light detection (ALD) value. The associated

pulse width modulation (PWM) signal for this value is PWMALD. The TCA6507 can be programmed such that

PWMALD overrides PWM0 or PWM1 so selected LEDs are on steadily at the master intensity level. Further, the

TCA6507 can be programmed such that the ALD value can override the maximum intensity values for PWM0

and PWM1. Thus, the ALD value can control the brightness of all LEDs whether they are on steadily or controlled

by one of the dimming modules. The ALD value is stored in the lower four bits of the One-Shot / Master Intensity

register.

setting the enable (EN) pin low. This mode provides additional power savings, as it is a low-power mode where

TCA6507 to their default state.

intensity (and intensity ramp if needed) for each bank of outputs. From then on, only one command from the bus

master is required to turn each individual output ON, OFF, or to cycle at the programmed dimming rate. The

default value for all time parameters is 256 ms so the default blink rate is approximately one per second.

The TCA6507 is optimized for 1.65 V to 3.6 V on the SDA/SCL side, but the LEDs can be driven by any voltage

up to 5.5 V. This allows the TCA6507 to interface with next-generation microprocessors and microcontrollers,

where supply levels are dropping down to conserve power.

This LED dimmer supports hot insertion.

ZXU PACKAGE TERMINAL ASSIGNMENTS

C

B

A

1

P1

P2

GND

2

P3

EN

SDA

3

P4

P0

SCL

4

P5

P6

2

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Product Folder Link(s): TCA6507