Electrical Characteristics
Absolute Maximum Ratings
Storage Temperature....................... -65°C to +150°C
Ambient Temperature with
Power Applied....................................-40°C to +85°C
Voltage on VDD with respect to VSS............ 0 to +7.5V
Voltage on any other pin with
respect to VSS........................... -0.3V to (VDD + 0.3V)
Note:
Stresses beyond those listed here will likely damage
the device. These values are given as a design
guideline only. The ability to operate to these levels
is neither inferred nor recommended.
Notes:
1. This integrated circuit is produced with a Microchip Technology Inc.’s PIC18F248 or PIC18F2480 as the
core embedded microcontroller. For further device specifications, and possibly clarification of those given,
please refer to the appropriate Microchip documentation (available at http://www.microchip.com/).
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. Device only. Does not include any load currents.
4. Pins 1, 11, 12, 13, 15 and 18 have internal Schmitt trigger waveshaping circuitry
5. The typical width of the Busy output pulse while the ELM327 interprets the command, measures the voltage,
scales it and transmits the result of a mid-range measurement at 38400 baud.
4 of 5
ELM327
ELM327QSA
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
All values are for operation at 25°C and a 5V supply, unless otherwise noted. For further information, refer to note 1 below.
Characteristic
Minimum
Typical
Maximum
Conditions
Units
Supply voltage, VDD
4.5
5.0
5.5
V
VDD rate of rise
0.05
V/ms
Average supply current, IDD
9
mA
Input threshold voltage
1.0
1.3
V
Output low voltage
Output high voltage
current (sink) = 10 mA
current (source) = 10 mA
see note 2
see note 5
see note 3
Schmitt trigger
input thresholds
Brown-out reset voltage
4.07
4.2
4.59
V
rising
falling
A/D conversion time
7
msec
all except Schmitt inputs
V
V
0.3
4.6
V
V
3.0
1.4
see note 4
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