ELM327P datasheet(6/76 Pages) ELM

6 / 76 page

Electrical Characteristics

6 of 76

ELM327DSH

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

Notes:

1. This integrated circuit is based on Microchip Technology Inc.’s PIC18F2480 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. This is the time between when the AT RV command is received, and when the voltage reading response

begins.

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 current, IDD

Input logic levels

0.8

3.0

Output low voltage

Output high voltage

current (sink) = 10 mA

current (source) = 10 mA

see note 2

see note 3

ELM327 device only - does not

include any load currents

Schmitt trigger

input thresholds

Brown-out reset voltage

4.11

4.33

4.55

rising

falling

A/D conversion time

msec

Pins 5, 6, 7, and 24 only

0.3

4.4

2.9

1.5

Pins 1, 11, 12, 13, 15 and 18 only

1.0

4.0

ELM327

IgnMon debounce time

AT LP to PwrCtrl output time

LP ALERT to PwrCtrl output time

2.0

sec

msec

sec

1.0

0.15

normal

low power

Pin 18 low level pulse duration to

wake the IC from Low Power mode

µsec

128

low

high

VDD

VSS

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