Pololu Qik 2s12v10 - Manual (Page 8)

• Time to overheat at 30 A: < 1 s
• Time to overheat at 20 A: 35 s
• Time to overheat at 15 A: 150 s
• Time to overheat at ≤ 13 A: N/A (does not overheat)
Note that these above times were obtained using only one driver with 100% duty cycle at room
temperature without a heat sink. Drawing high currents from both drivers simultaneously could
cause them overheat faster. Switching-induced power losses arising from duty cycles below 100%
could also cause the drivers to overheat faster and lower the continuous current rating.
3.b. Logic Connections
Serial Lines: RX, TX, and SIN
The qik can accept a logic-level (0 – 5 V), non-inverted serial input connected to its serial receive line, RX, and it
can handle baud rates from 1200 – 115,200 bps. This type of serial is often referred to as TTL and is an interface
method commonly used by microcontrollers. The voltage on this pin should not exceed 5 V. The qik provides
logic-level (0 – 5 V), non-inverted serial output on its serial transmit line, TX, in response to commands that
request information. Information requests always result in the transmission of a single byte per request. If you
aren’t interested in receiving feedback from the qik, you can leave this line disconnected.
The qik can also accept RS-232 serial input connected to the serial receive line, SIN. A computer serial port
typically communicates via RS-232 serial, which is inverted and uses voltages that would be out of spec for the
rest of the qik’s inputs (e.g. -12V to 12V), so SIN is the only pin to which it is safe to make a direct RS-232
connection. The qik does not have an RS-232 output, so you will need to use an RS-232 level converter connected
to the logic-level output if you want RS-232 feedback from the qik.
Qik 2s12v10 User's Guide © 2001–2012 Pololu Corporation
3. Connecting the Qik Page 8 of 33