CLI
The third USB serial port provides access to the UARTC0_TX and UARTC0_RX
lines of the LTC5800 (when JP1 “CLI OFF” jumper is not installed).
A 2-wire serial interface is supported; typically 9600 baud, the baud rate is
application dependant and is described in the
Eterna Board Specific Parameter
Configuration Guide
.
API
The fourth USB serial port provides access to the serial API of the Eterna Evaluation
& Development Board EManager (when JP1 “API OFF” jumper is not installed).
The API serial interface supports from 2-wire to 6-wire communication. Typically
115200, the baud rate is application dependant and is described in the
Eterna Board
Specific Parameter Configuration Guide
..
Signal & Power Isolation
The Interface Card provides isolated power and signals to the Eterna Evaluation &
Development Board from the USB micro-B interface (J1).
The external JTAG connector (P1) features signals that are directly connected to the
Eterna Evaluation & Development Board connector. P1 signals are referenced to the
isolated ground.
Power Switch-Over
The Interface Card compares its VCCA rail to the battery voltage from the Eterna
Evaluation & Development Board. When the VCCA rail is within 150 mV of the
battery voltage, the PGOOD signal is asserted.
The Eterna Evaluation & Development Board uses the PGOOD signal to switch its
supply from battery to the power provided by the Interface Card (VUSB_3V6).
Mote Current Sensing
The Interface Card provides two current sensing headers (P3 and P4) working in
conjunction with the JP5 jumper as shown in the schematics below.
With JP5 jumper installed, a voltmeter across P4 will measure the mote
consumption: P4 voltage is equal to 10 times the mote current (voltage drop across
the 10-ohm sense resistor R55 caused by the ISO_VSUPPLY current).
Alternatively and with JP5 is removed, a ammeter may be connected across P3 to
directly measure the mote current.
8 A
NALOG
D
EVICES
,
I
NC
.
C
ONFIDENTIAL
DC9006A
AND
DC9004B
U
SER
G
UIDE
