IMC CANSAS - Totem-Pole Mode

DO16 digital outputs 305
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
At the output of each channel x (denoted in the connection terminal by "Bit x"), there is a transistor
configured as an open collector. When a target value of "0" (low) is output, the transistor is switched
through (conducts). The result is that the output is connected to ground (denoted by LCOM in the
connection terminal). For a target value of "1" (high) at the output, the transistor is closed (has high
impedance). In order for there to be a defined voltage in for this state, the output must be connected to
the positive voltage supply via a load. HCOM's voltage differential to LCOM is 5 V and can take a small
load; refer to the technical specs for more info. Instead of HCOM, an external source of (higher) voltage
can be connected via the load or a pull-up resistor.
6.9.3.2 Totem-Pole Mode
Outputs configured as Totem-Pole
In totem pole mode the output is configured as a low-impedance driver switching between the two
supply rails 0 V and 5 V.
For a target value of "1" (high), the internal supply voltage 5 V, referenced to LCOM, is applied to the
output. If an external voltage > 5 V to LCOM is applied at HCOM's terminal, it is used instead of the
internal 5 V. A voltage of 5 V is accessible at HCOM which can take a small load; refer to technical specs
for details.
For a target value of "0" (low), the output is connected with LCOM and thus is at a differential of 0 V to
LCOM (LCOM being the reference).
Each of the two plugs has its own independent references. LCOM is basically the plug's reference ground,
and HCOM the plug's supply. LCOM comes from "Low" and "common", whereas HCOM comes from
"High" and "common".
The terminal plug CON1 is access for Bits 1...8; CON2 for Bits 9...16.