pca9901 NXP Semiconductors, pca9901 Datasheet - Page 12

• Manufacturer Part Number: pca9901
• Description: One Wire Single Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9901_1
Product data sheet
8.12 Reset
8.11 Shutdown mode
If the fault condition goes away during normal mode operation, the reference current
circuitry and the LED output stage are again enabled, allowing the PCA9901 to resume
control of the LED output stage (LEDOUT).
A short-circuit condition is detected when the PCA9901's current consumption becomes
higher than 50 mA.
An overtemperature condition is detected when the temperature goes above 125 °C. It
goes away when the temperature goes 15 °C below the overtemperature condition.
Shutdown mode is the low power mode where the internal oscillator, band gap, current
generator and LED driver are turned off to save power, and is the default mode at
power-up.
Shutdown mode is automatically entered after:
When in Shutdown mode, setting CTRL HIGH immediately exits the Shutdown mode: the
oscillator and the band gap are turned on and it takes up to 1.5 ms for the device to be up
and running and decode the command issued by the host controller.
Reset mode is achieved by sending a RESET command and causes all the registers to be
reset to zeroes and the device to go to Shutdown mode.
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A RUN ONCE sequence has been executed
A STOP command
A TRAINING END command
A RESET command
A Time-out condition has been detected.
Rev. 01 — 3 December 2009
One wire single LED driver
PCA9901
© NXP B.V. 2009. All rights reserved.
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