TM1628 Datasheet – LED Controller Driver – Titan Micro

What is TM1628?

It is designed to control LED and seven-segment displays, and it features a built-in keypad scanning function.

The TM1628 IC is designed to interface with microcontrollers and other digital circuits. It communicates using a 3-wire serial interface, which makes it easy to integrate into a wide range of applications. The TM1628 can control up to 8 digits of 7-segment displays, or up to 64 individual LEDs.

One of the key features of this is its built-in keypad scanning function. This allows it to scan up to 24 keys in a matrix arrangement, which is useful for applications such as remote controls or other input devices.

Part Number: TM1628

Function: LED Controller driven on a 1/7 to 1/8 duty factor.

Package: SSOP 28 Pin Type

Manufacturer: Titan Micro Integrated Circuit

TM1628 pinout


The TM1628 is an LED Controller driven on a 1/7 to 1/8 duty factor. Eleven segment output lines, six grid output lines, 1 segment/grid output lines, one display memory, control circuit, key scan circuit are all incorporated into a single chip to build a highly reliable peripheral device for a single chip microcomputer. Serial data is fed to TM1628 via a three-line serial interface.

Housed in a 28-pin SO Package, Device pin assignments and application circuit are optimized for easy PCB Layout and cost saving advantages.

It includes a variety of features to control the display brightness and intensity. It has 16 levels of brightness control and supports both static and dynamic display modes.

Block Diagram :

TM1628 datasheet, block diagram


• CMOS Technology

• Low Power Consumption

• Multiple Display Modes (12 segment, 6 Grid to 11 segment, 7 Grid)

• Key Scanning (8 x 2 Matrix)

• 8-Step Dimming Circuitry

• Serial Interface for Clock, Data Input/Output, Strobe Pins

• Available in 28-pin, SOP Package


• Micro-computer Peripheral Device

• VCR set

• Combi set

TM1628 Datasheet PDF Download

TM1628 pdf


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What is ULN2803A? – Darlington Sink Driver – Toshiba

What is ULN2803A?

This is a high-voltage, high-current Darlington transistor array. It consists of eight NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for inductive load transient suppression. The ULN2803A is commonly used in a range of electronic circuits to interface low-level logic to high-power loads, such as motors, solenoids, and lamps.

Part Number: ULN2803A

Function: 8-Channel Darlington Sink Driver

Package:  AP type : DIP-18pin, AFW type-SOL-18pin

Manufacturer: Toshiba

ULN2803A datasheet


The ULN2803A / ULN2803AP / ULN2803AFW Series are high−voltage, high−current darlington drivers comprised of eight NPN darlington pairs. All units feature integral clamp diodes for switching inductive loads. Applications include relay, hammer, lamp and display (LED) drivers. High-voltage, high-current darlington drivers comprised of eight NPN darlington pairs.

Advantages Vs Disadvantages


1. High-current capability
2. High-voltage outputs with inductive load transient suppression
3. Compact size with multiple channels in a single package
4. Low saturation voltage, which reduces power consumption
5. High input impedance and low input current make it easy to drive with low-level logic signals


1. The Darlington pairs have a high saturation voltage, which can lead to power dissipation and heating of the device

2. The ULN2803A does not provide isolation between the input and output, which can be a concern in some applications

3. The device is not suitable for high-speed switching applications


1. Output current (single output) : 500 mA (Max.)

2. High sustaining voltage output : 50 V (Min.)

3. Output clamp diodes

4. Inputs compatible with various types of logic.

ULN2803A Datasheet PDF Download

ULN2803A pdf

Other data sheets are available within the file:

ULN2803, ULN2803AFW, ULN2803AP, ULN2804