User's Guide

DT-0237A page 7 of 34 Rev: 1.1
CONFIDENTIAL
DISTRIBUTED UNDER LICENSE
3 Functional Description
OSDI Module
The OSDI modules are low power 2.4GHz ISM band transceivers. Figure 1 below shows a block diagram of the OSDI-4000 modules and
the surrounding optional functionalities that are intended as a reference implementation example.
The configuration of the transceiver, reading and writing of Frame Buffer is controlled by a SPI interface and additional control lines. The
control of the RF front-end is done via the transceiver digital control pins.
The OSDI modules are equipped with a Low Drop Out voltage (LDO) regulator that enables them to work in standalone mode with a
voltage supply between 4 and 5 volts.
The VCPU power supply line of the microcontroller is available on the external connection for optional backup supply when Real Time
Power Outage Reporting (RTPOR) is required.
Figure 1: Typical application with OSDI Module
Host Interface & Optional IOs
Communication with the host is achieved using a serial communication port and control signals that are bundled with the power lines
inside the host connector. Diagnostic and programming signals are available to the host. See Table 1 below for the description of the
various signals found in the diagnostic and programming interface. The RF input/output signal must be routed through the host device as
described in section 5.4. Antennas of section 4 can be used in relation with regulation. The OSDI module is designed with outputs to
drive a multicolor LED indicator that allows visual diagnostic and status monitoring of the device. See Table 1 below for an interpretation
of the existing LED patterns.
Interface and Control Signals
Table 1: OSDI module control signals description and usage.
Signal Description Usage
TX_EXT-RX_LGA
Transmit from the meter / Receive to the
module.
Signal Type: UART.
• Meter Connector serial port.
• Meter USB Port.
• Default baud rate is set to 9.6 kbps.
RX_EXT-TX_LGA
Receive to the meter / Transmit from the
module.
Signal Type: UART.