P
AGE
21
1054417, V
ER
. 01
Alice
®
PDx
TM
Service & Technical Reference Manual
Under this scheme, the microcontroller can initiate a shutdown not only in response to a user request, but
anytime it is necessary. A weak battery, or, a detected malfunction in the unit may be cause for a system
shutdown.
A
CTIMETRY
UART (U1)
A UART (Universal Asynchronous Receiver Transmitter), which is accessible to the microcontroller via an I2C
port is provided to support a future external actigraphy sensor.
A
NALOG
V
OLTAGE
R
EFERENCE
A precision 3.0 VDC reference is provided to the microcontroller ADC and the 16 bit external ADC (U30) by the
analog reference regulator (U13). ANALOG_REF is also derived from this signal.
N
ON
-V
OLATILE
D
ATA
S
TORAGE
32 Kbytes of non-volatile data storage is provided by EEPROM U4.
A
DDITIONAL
D
ATA
S
TORAGE
32 Kbytes of additional temporary data storage is provided by U36. This RAM memory is accessed by an SPI
port.
NOTE
Refer to Alice PDx Digital Board Schematic sheet 2 located in the
Schematics section beginning on page 53.
NOTE
Refer to Alice PDx Digital Board Schematic sheet 3 located in the
Schematics section beginning on page 53.
NOTE
Refer to Alice PDx Digital Board Schematic sheet 3 located in the
Schematics section beginning on page 53.
NOTE
Refer to Alice PDx Digital Board Schematic sheet 3 located in the
Schematics section beginning on page 53.
