ELM327P datasheet(4/51 Pages) ELM

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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 one of Microchip Technology Inc.’s PIC18F2x8x family of devices 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 (only) have internal Schmitt trigger waveshaping circuitry. All other inputs use

standard CMOS circuitry.

5. The typical width of the Busy output pulse while the ELM327 interprets the command, measures the voltage,

scales it and then transmits the result of a mid-range measurement, with the RS232 rate at 38400 baud.

4 of 51

ELM327

ELM327DSC

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

VDD rate of rise

0.05

V/ms

Average supply current, IDD

Input threshold voltage

1.0

1.3

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

rising

falling

A/D conversion time

msec

all except Schmitt inputs

0.3

4.6

2.9

1.5

see note 4

1.0

4.0

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