Electronic Components Datasheet Search |
|
TCA6507 Datasheet(PDF) 2 Page - Texas Instruments |
|
|
TCA6507 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 32 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 ORDERING INFORMATION TA PACKAGE(1)(2) 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). Each bank of outputs can be independently controlled for dimming rate and intensity through the I2C bus. The 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. When the I2C bus is idle, and intensity control is not used, the TCA6507 can be put into shutdown mode by setting the enable (EN) pin low. This mode provides additional power savings, as it is a low-power mode where the LEDs are off. A low signal on the EN pin also resets the registers and I2C/SMBus state machine in the TCA6507 to their default state. An initial setup command must be sent from the I2C master to the TCA6507 to program the dimming rate and 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 VCC 2 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 |
Similar Part No. - TCA6507 |
|
Similar Description - TCA6507 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |