IS31FL3731

Part: IS31FL3731 — Integrated Silicon Solution, Inc. (ISSI)

Type: Audio Modulated Matrix LED Driver

Description: 2.7 V to 5.5 V 144-dot matrix LED driver with 8-bit individual linear PWM dimming, 8-frame animation memory, audio modulation, and I2C control.

Operating Conditions:

• Supply voltage: 2.7 to 5.5 V
• Operating temperature: -40 to +85 °C

Absolute Maximum Ratings:

• Max supply voltage: 5.5 V
• Voltage at any input pin: -0.3 V to VCC + 0.3 V
• Max junction/storage temperature: 150 °C (storage -65 to +150 °C)

Key Specs:

• Quiescent supply current: 2.17 mA (VIN = 0 V, without audio input, all LEDs off)
• Shutdown current: 0.5 μA typ, 5 μA max (VSDB = 0 V)
• Output current (C1–C9): 34 mA typ (matrix display mode without audio modulation)
• Average LED current: 3.2 mA typ (REXT = 20 kΩ, PWM in 255 step)
• Current sink headroom voltage (C1–C9): 400 mV typ (Isink = 270 mA)
• Current source headroom voltage (C1–C9): 400 mV typ (Isource = 34 mA)
• Scan period: 106 μs typ
• Non-overlap blanking time: 15 μs typ
• Maximum I2C clock frequency: 400 kHz

Features:

• Drives up to 144 single LEDs using cross-plexing with 18 control lines
• 256 steps (8-bit) linear PWM dimming for each LED
• 8 frames of memory for autonomous animation play
• Individual LED blink control
• Audio modulation of LED display frames and intensity
• Auto intensity breathing during frame switching
• Hardware and software shutdown modes

Applications:

• Mobile phones and other hand-held devices for LED display
• LED in home appliances

Package:

• QFN-28 (4 mm × 4 mm)
• SSOP-28

• Supply voltage range: 2.7V to 5.5V
• 400kHz I2C-compatible interface
• 144 LEDs in dot matrix
• Individual blink control
• 8 frames memory for animations
• Picture mode and animation mode
• Auto intensity breathing during the switching of different frames
• LED frames displayed can be modulated with audio signal intensity
• LED light intensity can be modulated with audio signal intensity
• QFN-28 (4mm × 4mm) and SSOP-28 package

• Mobile phones and other hand-held devices for LED display
• LED in home appliances

May 2013

TA = -40°C ~ +85°C, V CC = 2.7V ~ 5.5V, unless otherwise noted. Typical value is T A = 25°C, VCC = 3.6V.

Figure 1 Typical Application Circuit

Note 1: The IC should be placed far away from the mobile antenna in order to prevent the EMI.

Note 2: The average current of each LED is 3.2mA when REXT = 20k Ω . The LED current can be modulated by the REXT . Please refer to the detail information in Page 18 .