Data Sheet

Q4000 Technical Data Sheet
Document 1135-0902, REV K 21
To increase current drive, insert a buffer with high input impedence between the DIGX_IF configured as an
output and the load as shown below. A typical buffer might be a 74 series 126 with a part number of
74LVC1G126DBV. This will increase the drive to > +/- 20 milliamps.
Figure 4-6, Buffer for DIO as Output
4.1.2.3 Switched Digital Relays
There are four digital relays available on Pins 26/28 and 25/27:
• Two pins provide switch closure to ground Pins 26 and 28
• Two pins route the supplied input voltage Pins 25 and 27.
Two of the inputs can source (pulls to input voltage) and two sink (pulls to ground) at 1A continuous current
at ambient temperatures and are de-rated as seen in the chart below.
Figure 4-7, Switched Relay Characteristics
Warning: Connecting SW_UBATT1 or SW_UBATT2 (pin 27 and 25) directly to ground while the switch
is turned “ON” will damage the unit. If SW_GND1 or SW_GND2 (pin 26 and 28) is tied directly to VBATT (Pin
1 and 2) while the switches are turned “ON,” the unit will be damaged.
DIGX_IF
Buffered
Output
BUFFER
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