PCA9551D,112
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NXP USA Inc. PCA9551D,112

Manufacturer No:
PCA9551D,112
Manufacturer:
NXP USA Inc.
Package:
Tube
Description:
IC LED DRIVER PS PWM 25MA 16SO
Delivery:
Payment:
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Product Introduction

Overview

The PCA9551D,112 is an 8-bit I2C-bus LED driver with programmable blink rates, manufactured by NXP USA Inc. This device is designed to control LEDs in I2C-bus and SMBus applications, particularly where minimizing bus traffic and freeing up the I2C-bus master's timer are crucial. The PCA9551 features an internal oscillator that allows for two fully programmable blink rates, reducing the need for repeated commands from the bus master and thus lowering the overall bus traffic.

Key Specifications

ParameterValue
Package TypeSO16
Operating Power Supply Voltage2.3 V to 5.5 V
Maximum Output Sink Current per Bit25 mA
Maximum Output Sink Current per Package100 mA
Blink Rate Frequency Range0.148 Hz to 38 Hz
I2C-bus Clock Frequency0 Hz to 400 kHz
ESD Protection2000 V HBM, 150 V MM, 1000 V CDM
Address Pins3 (allowing 8 devices on the same bus)
Reset PinActive LOW hardware reset

Key Features

  • 8 LED drivers with programmable on, off, and flashing states
  • 2 selectable, fully programmable blink rates (frequency and duty cycle)
  • Internal oscillator requiring no external components
  • I2C-bus interface logic compatible with SMBus
  • Internal power-on reset and noise filter on SCL/SDA inputs
  • Active LOW reset input and 8 open-drain outputs directly driving LEDs up to 25 mA
  • Edge rate control on outputs and support for hot insertion
  • Low standby current and no glitch on power-up

Applications

The PCA9551D,112 is suitable for various applications, including LED backlight drivers for LCD displays in tablets and notebooks, refrigeration lighting, and other scenarios where controlled LED blinking is necessary. It is particularly useful in systems where minimizing I2C-bus traffic and conserving the master's resources are important.

Q & A

  1. What is the primary function of the PCA9551D,112?
    The PCA9551D,112 is an 8-bit I2C-bus LED driver with programmable blink rates, designed to control LEDs while minimizing I2C-bus traffic.
  2. What is the range of the programmable blink rates?
    The blink rates are programmable between 0.148 Hz and 38 Hz.
  3. What is the maximum output sink current per bit and per package?
    The maximum output sink current is 25 mA per bit and 100 mA per package.
  4. What is the operating power supply voltage range?
    The operating power supply voltage range is from 2.3 V to 5.5 V.
  5. Does the PCA9551D,112 support hot insertion?
    Yes, it supports hot insertion.
  6. How many devices can operate on the same bus using the PCA9551D,112?
    Up to 8 devices can operate on the same bus due to the 3 address pins.
  7. What is the purpose of the internal oscillator?
    The internal oscillator allows for programmable blink rates without requiring external components.
  8. Does the PCA9551D,112 have ESD protection?
    Yes, it has ESD protection exceeding 2000 V HBM, 150 V MM, and 1000 V CDM.
  9. Can unused bits be used for other purposes?
    Yes, any bits not used for controlling LEDs can be used as General Purpose parallel Input/Output (GPIO) expansion.
  10. What happens during a power-on reset?
    The registers are initialized to their default state, all zeroes, causing the bits to be set HIGH (LED off).

Product Attributes

Type:Power Switch
Topology:- 
Internal Switch(s):Yes
Number of Outputs:8
Voltage - Supply (Min):2.3V
Voltage - Supply (Max):5.5V
Voltage - Output:- 
Current - Output / Channel:25mA
Frequency:- 
Dimming:PWM
Applications:- 
Operating Temperature:-40°C ~ 85°C (TA)
Mounting Type:Surface Mount
Package / Case:16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:16-SO
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Similar Products

Part Number PCA9551D,112 PCA9551D,118 PCA9552D,112 PCA9531D,112 PCA9550D,112
Manufacturer NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc.
Product Status Obsolete Active Obsolete Obsolete Obsolete
Type Power Switch Power Switch Power Switch Linear Linear
Topology - - - - -
Internal Switch(s) Yes Yes Yes Yes Yes
Number of Outputs 8 8 16 8 2
Voltage - Supply (Min) 2.3V 2.3V 2.3V 2.3V 2.3V
Voltage - Supply (Max) 5.5V 5.5V 5.5V 5.5V 5.5V
Voltage - Output - - - - -
Current - Output / Channel 25mA 25mA 25mA 25mA 25mA
Frequency - - - - 400kHz
Dimming PWM PWM - I²C I²C
Applications - - - Backlight -
Operating Temperature -40°C ~ 85°C (TA) -40°C ~ 85°C (TA) -40°C ~ 85°C (TA) -40°C ~ 85°C (TA) -40°C ~ 85°C (TA)
Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case 16-SOIC (0.154", 3.90mm Width) 16-SOIC (0.154", 3.90mm Width) 24-SOIC (0.295", 7.50mm Width) 16-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 16-SO 16-SO 24-SO 16-SO 8-SO

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