ELM327SM(2005) データシートの表示（PDF） - Elm Electronics

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ELM327SM
(Rev.:2005)

OBD to RS232 Interpreter

Elm Electronics 

ELM327

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.

Electrical Characteristics

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 Units

Conditions

Supply voltage, VDD

VDD rate of rise

Average supply current, IDD

4.5

5.0

0.05

9

5.5

V

V/ms see note 2

mA see note 3

Input threshold voltage

1.0

1.3

V all except Schmitt inputs

Schmitt trigger

rising

3.0

input thresholds

falling

1.4

V see note 4

V

Output low voltage

0.3

V current (sink) = 10 mA

Output high voltage

4.6

V current (source) = 10 mA

Brown-out reset voltage

4.07

4.2

4.59

V

A/D conversion time

7

msec see note 5

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.

ELM327QSA

Elm Electronics – Circuits for the Hobbyist

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