Welch Allyn SureTemp PlusModule - User Manual - Manual (Page 10)

Introduction SureTemp Plus Module OEM Implementation
10 Confidential Welch Allyn OEM Technologies
2 - Functional Description
Introduction
The SureTemp Plus module provides the interface to the host system, manages power
requirements, calculates measurements, and regulates probe heater circuitry.
This section describes the function of the SureTemp Plus module and describes how it is
integrated into a host system:
• "OEM Implementation" (page 13) describes the hardware interface and power
requirements.
• "Communications Protocol" (page 30) describes the SureTemp Plus module
communications protocol.
Module Integration
The SureTemp Plus module is designed for integration into a host system. The design intent is to
have the module located such that the probe tip and the probe covers are as close to ambient air
temperature as possible. Consequently, the host must provide only one interface cable to the
SureTemp Plus module. A flex circuit connector is populated on the module. The host is
responsible for the flex circuit design and procurement since every implementation is unique.
Power Supply Connections
The SureTemp Plus module requires one power connection:
3.3 (-0.135) Vdc to 5.0 (+0.30) VDC
Ripple not to exceed 100 mV peak-to-peak
A ‘low voltage’ error occurs below 3.00 VDC; a ‘high voltage’ error occurs at 5.375 VDC.
Host Serial Configuration
A simple system configuration consists of the SureTemp Plus module connected to a host
processor via a serial interface. TXD and RXD are logic level UART connections for transmitting
and receiving data. Pull-up resistors for RXD and TXD are located on the module.
The communication protocol and host serial commands are described in detail on page 30.