Elm Electronics – Circuits for the Hobbyist

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Absolute Maximum Ratings

Storage Temperature....................... -65°C to +150°C

Ambient Temperature with

Power Applied....................................-40°C to +85°C

Voltage on any other pin with

Note:

These values are given as a design guideline only.

The ability to operate to these levels is neither

inferred nor recommended, and stresses beyond

those listed here will likely damage the device.

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ELM325DSA

ELM325

Electrical Characteristics

Notes:

1. This integrated circuit is based on Microchip Technology Inc.’s PIC16F1823 device. For more detailed

device specifications, and possibly clarification of those given, please refer to the 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. ELM325 device only – does not include any load currents

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

1.8

5.0

5.5

V

0.05

V/ms

1.2

mA

8.0

mA

Output low current

Output high current

see note 2

3.5

3.0

J1708 Baud Rate

RS232 Baud Rate

Reset time

900

msec

bps

bps

57600

9600

0.75

msec

see note 3

6.0

mA

mA

mA

measured from the end of the

command to the start of the ID

message (ELM325 v1.0)

2.0

AT Z

AT WS