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10-Port, Constant-Current LED Driver and I/O Expander with PWM Intensity Control

Space-Saving, Constant-Current LED Driver with Reset

製品の詳細

主な特長

アプリケーション/用途

Parametric specs for I/O Port Expanders
Interface Serial - I2C Compatible
Reset Input Yes
Over Voltage Protection (V) 7
Drive Current (mA) 20
VSUPPLY (V) (min) 2.25
VSUPPLY (V) (max) 3.6
Package/Pins TQFN/16
Budgetary
Price (See Notes)
2.57
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簡易ブロック図

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パラメーター

Parametric specs for I/O Port Expanders
Interface Serial - I2C Compatible
Reset Input Yes
Over Voltage Protection (V) 7
Drive Current (mA) 20
VSUPPLY (V) (min) 2.25
VSUPPLY (V) (max) 3.6
Package/Pins TQFN/16
Budgetary
Price (See Notes)
2.57

主な特長

  • 2.25V to 3.6V Operation
  • I/O Ports Default to High Impedance (LEDs Off) on Power-Up
  • I/O Port Inputs Are Overvoltage Protected to 7V
  • I/O Port Outputs Are 7V-Rated Open-Drain, 10mA or 20mA Constant-Current Static/PWM LED Drivers, or Open-Drain Logic Outputs
  • I/O Ports Support Hot Insertion
  • Individual 8-Bit PWM Intensity Control for Each LED
  • Active-Low RST Input Clears Serial Interface and Can Exit Shutdown (Warm Start)
  • MAX6946 OSC Input Allows for External PWM Clock Input
  • MAX6947 AD0 Input Selects from Two Slave Addresses
  • Auto Ramp-Up Out of Shutdown, and Up to 4s Hold-Off Before Ramp-Down into Shutdown
  • 0.8µA (typ) Shutdown Current
  • -40°C to +125°C Temperature Range
  • Tiny WLP Package (4 x 4 Grid)

アプリケーション/用途

  • Cellular Phones
  • Keypad Backlights
  • LCD Backlights
  • LED Status Indicators
  • Portable Equipment
  • RGB LED Drivers

説明

The MAX6946/MAX6947 I²C-/SMBus™-compatible, serial-interfaced peripherals provide microprocessors with 10 I/O ports rated to 7V.

Each port can be configured as a 2.5mA to 20mA constant-current LED driver (static or PWM), a 1.25mA to 10mA constant-current LED driver (static or PWM), an open-drain logic output, or an overvoltage-protected Schmitt logic input.

Analog and switching LED intensity control includes individual 8-bit PWM control per output, individual 1-bit analog current control (half/full scale) per output, and a global 3-bit DAC current control that applies to all LED outputs.

The MAX6946/MAX6947 can stagger the PWM timing of the 10-port outputs in consecutively phased 45° increments. Staggering the outputs spreads the PWM load currents over time in eight steps, helping to even out the power-supply current and reduce the RMS current.

For a similar part with an SPI™-/QSPI™-/ or MICROWIRE™-compatible interface, refer to the MAX6966/MAX6967 data sheet.

簡易ブロック図

MAX6946, MAX6947: Typical Operating Circuit MAX6946, MAX6947: Typical Operating Circuit Zoom icon

サポートとトレーニング

技術質問への回答についてはナレッジベースで検索ください。

絞り込まれた検索

マキシムでは、お客様の技術的質問にお答えするため、アプリケーションエンジニアの専任チームも配置しています。 サポートセンター をご利用ください。