ELM323SM データシートの表示（PDF） - Elm Electronics

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ELM323SM

OBD (ISO) to RS232 Interpreter

Elm Electronics 

ELM323

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 +7.0V

Voltage on any other pin with

respect to VSS........................... -0.6V to (VDD + 0.6V)

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

1.0

5.5

V

V/ms see note 2

2.4

mA see note 3

Input low voltage

Input high voltage

Output low voltage

Output high voltage

RS232Rx pin input current

RS232 baud rate

VSS

0.85 x VDD

VDD - 0.7

-0.5

9600

0.15 x VDD

V

VDD

V

0.6

V Current (sink) = 8.7mA

V Current (source) = 5.4mA

+0.5

mA see note 4

baud see note 5

Notes:

1. This integrated circuit is produced with a Microchip Technology Inc.’s PIC16C505 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. This specification represents the current flowing through the protection diodes when applying large voltages

to the RS232Rx input (pin 5) through a current limiting resistance. Currents quoted are the maximum that

should be allowed to flow continuously.

5. Nominal data transfer rate when the recommended 3.58 MHz crystal is used as the frequency reference.

Data is transferred to and from the ELM323 with 8 data bits, no parity, and 1 stop bit (8 N 1).

ELM323DSD

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