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LP3943ISQX/NOPB Datasheet(PDF) 7 Page - Texas Instruments |
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LP3943ISQX/NOPB Datasheet(HTML) 7 Page - Texas Instruments |
7 / 25 page Prescaler 0 Register PWM 0 Register Oscillator Power-On Reset VDD RST 0 1 LED0 0 1 LED15 Bit 7 of Select Register LS3 Bit 6 of Select Register LS3 Bit 7 of Input Register2 PWM0 Register PWM1 Register COPIES Bit0 of Select Register LED Select Register Bit1 Input Register Bit0 of Input Reg 1 I 2C Bus Control I 2C Filters A2 A1 A0 SCL SDA LS0 Prescaler 1 Register PWM 1 Register LP3943 www.ti.com SNVS256C – NOVMEBER 2003 – REVISED OCTOBER 2015 7 Detailed Description 7.1 Overview The LP3943 takes incoming data from the baseband controller and feeds them into several registers that control the frequency and the duty cycle of the LEDs. Two prescaler registers and two PWM registers provide two individual rates to dim or blink the LEDs (for more information on these registers, refer to Table 1). Each LED can be programmed in one of four states: on, off, DIM0 rate, or DIM1 rate. Two read-only registers provide status on all 16 LEDs. The LP3943 can be used to drive RGB LEDs and/or single-color LEDs to create a colorful, entertaining, and informative setting. Alternatively, it can also drive RGB LED as a flashlight. This is particularly suitable for accessory functions in cellular phones and toys. Any LED pins not used to drive LED can be used for general purpose parallel input/output (GPIO) expansion. The LP3943 is equipped with power-on reset that holds the chip in a reset state until VDD reaches VPOR during power up. Once VPOR is achieved, the LP3943 comes out of reset and initializes itself to the default state. To bring the LP3943 into reset, hold the RST pin LOW for a period of TW. This puts the chip into its default state. The LP3943 can only be programmed after RST signal is HIGH again. 7.2 Functional Block Diagram Copyright © 2003–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LP3943 |
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