User's Manual

EE201 Specifications manual
7
5. Controls
Items Specifications Remarks
CPU
Type 8051 core 8-bit MCU
Internal flash ROM 96KB
Internal RAM 6 KB
Clock frequency 32 MHz
LCD
Active area W 45.8 x H 22.0 mm
Number of dots W 200 x H 96
Dot pitch
111 Horizontal
111 Vertical
Dots per Inch
Radio
Modulation DSSS
Frequency 2394 ~ 2507 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 2.0–3.3 V Lithium primary battery
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.
6.2. Battery
The power is supplied to the ESL by two coin shaped Lithium CR2450 batteries:
• Nominal capacity: 1200 mAh (two times 600mAh)
• Nominal voltage: 3.0 V.
• Maximum self-discharge rate: <1% per year
• Usable time: 7 years minimum (Update frequency: 4 times per day, poll time
20seconds)