ELM712
Electrical Characteristics
All values are for operation at 25°C and a 3V supply, unless otherwise noted. For further information, refer to note 1 below.
Characteristic
Minimum Typical
Maximum Units
Conditions
Supply Voltage, VDD
VDD rate of rise
3.0
3.0
5.5
V
see note 2
0.05
V/ms
During operation
Average Supply Current, IDD
0.60
0.1
2.0
5
mA
µA
In low power (standby) mode
Start pin internal pullup resistance
see note 3
470
750
1500
KW
LED Drive Current
VDD=3V
VDD=5V
9
mA
mA
No series limiting resistor
200Wseries limiting resistor
13
any output
Output Pulse Duration
Notes:
20
msec
1. This integrated circuit is produced with a Microchip Technology Inc.’s PIC12C5XX as the core embedded
microcontroller. For further device specifications, and possibly clarification of those given, please refer to the
appropriate Microchip documentation.
2. This spec must be met in order to ensure that a correct power on reset occurs. It is quite easily achieved
using most common types of supplies, but may be violated if one uses a slowly varying supply voltage, as
may be obtained through direct connection to solar cells, or some charge pump circuits.
3. The value of the pullup resistance is both supply and temperature dependent.
Example Application
Using the ELM712 is straightforward,
requiring little explanation. Typically it is connected
in a circuit as shown at the right. Pressing the start
pushbutton once initiates a sequence of LED
flashes that last approximately 15 seconds.
*see
text
8
1
7
2
6
5
4
The value of the resistor shown depends
on the voltage level that the circuit operates at. For
the circuit shown, no resistor is normally used, and
these points are jumpered out. For 5V operation, a
value of about 150 to 300 ohms is generally
inserted.
start
712
+
3V
3
3 of 3
ELM712DSB
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