Electronic Components Datasheet Search |
|
PCA9685 Datasheet(PDF) 26 Page - NXP Semiconductors |
|
PCA9685 Datasheet(HTML) 26 Page - NXP Semiconductors |
26 / 50 page PCA9685_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 16 July 2009 26 of 50 NXP Semiconductors PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller 7.4 Active LOW output enable input The active LOW output enable (OE) pin, allows to enable or disable all the LED outputs at the same time. • When a LOW level is applied to OE pin, all the LED outputs are enabled and follow the output state defined in the LEDn_ON and LEDn_OFF registers with the polarity defined by INVRT bit (MODE2 register). • When a HIGH level is applied to OE pin, all the LED outputs are programmed to the value that is defined by OUTNE[1:0] in the MODE2 register. The OE pin can be used as a synchronization signal to switch on/off several PCA9685 devices at the same time. This requires an external clock reference that provides blinking period and the duty cycle. The OE pin can also be used as an external dimming control signal. The frequency of the external clock must be high enough not to be seen by the human eye, and the duty cycle value determines the brightness of the LEDs. 7.5 Power-on reset When power is applied to VDD, an internal power-on reset holds the PCA9685 in a reset condition until VDD has reached VPOR. At this point, the reset condition is released and the PCA9685 registers and I2C-bus state machine are initialized to their default states. Thereafter, VDD must be lowered below 0.2 V to reset the device. Table 10. LED outputs when OE=1 OUTNE1 OUTNE0 LED outputs 000 0 1 1 if OUTDRV = 1, high-impedance if OUTDRV = 0 1 0 high-impedance 1 1 high-impedance |
Similar Part No. - PCA9685 |
|
Similar Description - PCA9685 |
|
|
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 |