User's Manual

EE440 Specifications manual
5. Controls
Items Specifications Remarks
CPU
Type 8051 core 8-bit MCU
Internal flash ROM 256KB
Internal RAM 8 KB
Clock frequency 32 MHz
LCD
Active area W 89.6 x H 67.2 mm
Number of dots W 400 x H 300
Dot pitch
113 Horizontal
113 Vertical
Dots per Inch
Radio
Modulation DSSS
Frequency 2405 - 2480 MHz
Globally approved
2.4GHz band.
Baud rate 250 Kbits / second
6. Electrical Specifications
6.1. Electrical Characteristics
Conditions: Operating voltage 3.0V unless otherwise specified
Parameter Typ Unit Remarks
Operating voltage 3.0 V
2x Alkaline AAA size battery
(Reference: Panasonic
LR03XWA)
Sleep current <1 uA
When the transmitter and
receiver are idle
Poll time
20
seconds
See below
The ESL is in sleep mode almost the entire time. The device wakes up at regular intervals
(called the poll time) and it then transmits a poll request to the base station. When the
base station has no data to send, it just acknowledges the poll after which the ESL
immediately goes back to sleep. The poll rate is configurable and is set to 20 seconds by
default. A higher poll rate will decrease the power consumption but will increase the
response time.
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