User Manual

Table Of Contents
Specifications B-2
SmartPoint Module for the Elster A3 Meter ECMTM40000
B.4 Internal Power Supplies
B.4.1 Micro Power Regulator
Always on, supplies power to CPU, VCO, Buffer Amplifier, Synthesizer, TCXO, and Receiver (if
implemented).
Drop Out: 60mV @ 50 mA load
Minimum Voltage Input: 3.4V
Maximum Voltage Input: 3.8V
Voltage Output: 3.3V
B.4.2 DC to DC Converter
Enabled during transmit operation.
Efficiency: 65% Minimum (70% typical)
Drop Out: 2 V maximum under 850 mA load
Converter Ripple: 100mV
Converter Impulse Response: 750 mA causes 20 mV spike (TBD)
Voltage Output: 3.6V +/- 5%
B.5 Start Up Timing Requirements
After changing from Charge Mode to other modes, the device takes the following amounts of time for different
components to be operational.
DC-DC Converter Stabilization: 10 msec
TCXO Stabilization: 10 msec
VCO Frequency Lock: 1.0 msec
Transmit RF Data: 1.0 msec