Output Specifications; Power Considerations; Equivalent Output Driver Circuit - Campbell SDM-CD16D User Manual

SDM-CD16D 16 Channel Digital Control Port Expansion Module

2.2 Output Specifications

NOTE
* If more detailed output characteristics are required, experienced users should consult the
equivalent circuit diagrams shown in Figure 2, below.
0.6V Drop
510R
5V, 0Ω
V
Output set ON/HI

3. Power Considerations

2
Output Voltage (no load): Output ON/HI, Nominal 5V (Minimum 4.5V)
Output Sink Current:
Output Source Current:
Max. Output Current:
(total all outputs)
The maximum current should be derated under the following
conditions:
50mA for every 10°C above 50°C and/or 50mA for every volt
above 12V.
Operating temp.:
Size:
Weight:
EMC Status:
Output
39R
Figure 2 Equivalent Output Driver Circuit
The SDM-CD16D power requirements are large compared to most Campbell
Scientific products when driving significant loads. For many applications an
external power supply, as shown in Figure 3, is recommended to power the
SDM-CD16D.
For some applications it may be convenient to use the datalogger supply to power
the SDM-CD16D, as shown in Figure 3. For long-term applications, the lead-acid
power supply available with Campbell Scientific dataloggers should be used,
allowing the batteries to be float charged. Alkaline batteries are not recommended
for long term applications.
Output OFF/LO, Nominal 0V (Maximum 0.1V)
Output will sink 8.6mA from a 5V source*
Output will source 36mA @ 3V,
115mA short-circuited to ground*
400mA at 50°C and 12V supply (see NOTE below)
-25°C to +70°C standard
230mm wide x 100mm high x 24mm deep
350g
Complies with EN55022-1:1998 and
EN50082-1:1998
Output set OFF/LO
Output
580R