Pololu Qik 2s9v1 Dual Serial Motor Controller

This small, inexpensive motor controller allows variable speed and direction control of two small, brushed DC motors using a simple serial interface, making it easy to add motors to your microcontroller- or computer-based project. The motor supply voltage range is 4.5 to 13.5 V; the continuous current per channel is up to 1 A (3 A peak). The logic supply can be as low as 2.7 V, allowing operation with modern microcontrollers running at 3.3 V.
Dimensions
Size: 0.70″ x 1.20″
Weight: 2 g1
General specifications
Motor driver: TB6612FNG
Motor channels: 2
Control interface: non-inverted TTL serial2
Minimum operating voltage: 4.5 V
Maximum operating voltage: 13.5 V
Continuous output current per channel: 1 A
Peak output current per channel: 3 A
Maximum PWM frequency: 32 kHz3
Minimum logic voltage: 2.7 V
Maximum logic voltage: 5.5 V
Reverse voltage protection?: Y4

Notes:

1 Without included hardware.
2 Autodetects baud rates between 1200 and 38,400 bps, or can be set for a fixed 38,400 bps baud rate.
3 Can also be configured to use 15.7 kHz, 7.8 kHz, or 3.9 kHz PWM frequencies.
4 On motor voltage only; logic voltage does not have reverse protection.