User's Guide

DT-0237A page 8 of 34 Rev: 1.1
CONFIDENTIAL
DISTRIBUTED UNDER LICENSE
Signal Description Usage
DIAG-RX_LGA
Module receive diagnostic port.
Signal Type: UART.
•
Diagnostic serial port
• Diagnostic USB Port.
• Default baud rate is set to 9.6 kbps in diagnostic mode
and 19.2 kbps in trace mode.
• Should be accessible via test points in normal design.
DIAG-TX_LGA
Module transmit diagnostic port.
Signal Type: UART.
RED_LED and
GRN_LED
Control Red and Green LEDs.
Signal Type: Active low output.
0=LED on, 1= LED off.
Note: Red and green led are in one physical
unit. Yellow is produced when both LEDs
are on.
• Diagnostic LEDs.
• Needs to be visible from the outside of the meter for
installation purposes in normal design.
LEDs off: Power save mode/POR mode or no power.
Flashing green: Initialization (5 sec).
Steady Red: Working but not associated to a network.
Steady Yellow: Working and trying to associate to a network.
Steady Green: Working and associated to a network.
Flashing Yellow: Working and exchanging info.
P-FAIL_EXT
External signal from the meter indicating
that an interruption of power has been
detected.
Signal Type: Active low input from the
meter.
0 = Power fail, 1 = Normal condition.
• Meter Connector.
• PFAIL Circuit.
Provides an early detection of power outage events.
P-FAIL
Signal indicating that an interruption of
power has been detected.
Signal Type: Interrupt input.
0 = Power fail, 1 = Normal condition.
• PFAIL Circuit.
• CPU Reset Control Circuit.
Provides early detection of power outage events.
RESET
Signal Type: Hardware reset.
0 = Reset, 1 = Normal operation.
• CPU Reset Control Circuit.
• For use during development only.
• Do not connect to the meter.
TEST
Select test / diagnostic mode.
Signal Type: Active high input.
1 = Diagnostic mode, 0 = Normal mode.
• Reserved
• Diagnostic/Programming Connector.
• Should be accessible via test points in normal design.
SC_HI
Signal Type: Input.
1 = Supercap voltage > 3.6V
• On/off signal from the fail safe circuit to detect if the
super cap is higher than 3.6V.
PWR_MON
Power supply monitoring signal.
Signal Type: Analog.
• Meter Connector.
Provision for self-detection of power outages by the OSDI
modules, if P-FAIL is not available.
RESET-PDI_CLK,
TDI-PDI_DATA,
TDO, TMS, TCK
Program and Debug Interface.
• Diagnostic/Programming Connector.
• Used only during development.
• See schematic for proper use.
• Should be accessible via test points in normal design.
SLEEP
Sleep mode power activation.
Signal Type: low open-drain output.
0 = SLEEP Enabled, 1 = SLEEP Disabled.
• RTPOR Supply Management circuit.
Used to send the command to the power management circuit
to connect the 1.5 Farad capacitor (+V1.5F) directly to the
input supply (+VCPU) of OSDI module’s CPU in order to feed
it with minimum power waste, in sleep mode.
MESURE_VCAP
1.5 Farad capacitor voltage monitoring.
Signal Type: Analog, feeds ADC input.
Provision for monitoring of voltage level of the 1.5F capacitor.
+3.3V
LDO voltage regulator’s output.
Regulated 3.3V voltage supply from the OSDI module.
+VMAIN
Main power supply input.
Used by the power management circuit as input to the LDO
regulator and to charge the 1.5 Farad super capacitor.
+VCPU2
3.3 Volts supply for OSDI module’s CPU.
Used to feed power to the CPU during debug and
programming.
+VCPU
3.3 Volts supply for OSDI module’s CPU.
Input supply (+VCPU) of OSDI module’s CPU.
+VLDO_IN
LDO regulator’s input.
Input of the LDO regulator (+VLDO) of the OSDI module.
+V1.5F_SW
1.5 Farad capacitor switched voltage.
Power path for the sleep mode power supply.