Welch Allyn SureTemp PlusModule - User Manual - Manual (Page 15)

SureTemp Plus Module OEM Implementation OEM Implementation
Welch Allyn OEM Technologies Confidential 15
Host Connector Interface
The module interfaces the host system through a single 6-pin interface:
Table 1. Host Connector Pin Descriptions
Probe Connector
The SureTemp Plus module includes an eight-pin right-angle EDAC connector for the probe
connection. This eliminates the need for a special wiring harness.
However, should the host have to remotely mount the probe connector, an available option
replaces the EDAC with a Standard ZIF cable connector, MOLEX part number 52271-0890. This
option requires the integrator to create a circuit board to contain the MOLEX and EDAC
connectors and then mount it remotely from the OEM module.
Keep added resistance in the remote probe connector to an absolute minimum. All connectors
must be gold-plated and non-intermittent to prevent additional resistance build-up in series with
the probe connection. Probe ID, probe thermistor, and heater control are negatively affected and
system performance is compromised if the added resistance is too high.
Power Requirements
The system employs a heater in the oral/axillary probe tip to speed the warming process and
reduce measurement times. The heater operates most effectively from a 5V supply. The host
should consider the impact to heating and measurement times when operating from lower supply
voltages. For example: A 3.3 V system takes longer to achieve the ready state than a 5 V system.
SureTemp Plus module connector Molex 52271-0690
Standard ZIF cable- same side, 1-mm pitch Parlex AWM Style 20566
Pin Description Note
J1-1 RXD Module Receive from Host.
Levels follow Vcc and ground.
J1-2 TXD Module Transmit to Host.
Levels follow Vcc and ground.
J1-3 HOST-WAKEUP-BAR Active Low.
The host must wait 500 mS after asserting the host wake-
up before sending a command.
J1-4 RESET-BAR Active Low. Hold low for 1
µ
s to insure correct power-up.
J1-5 GND
J1-6 Vcc 3.3 (-0.135) Vdc to 5.0 (+0.30) VDC
Ripple not to exceed 100 mV peak-to-peak