ELM320 Datasheet, PDF (3/16 Pages) ELM Electronics – OBD (PWM) TO RS232 INTERPRETER

ELM320
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........................... -0.6V 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
4.5
5.0
5.5
V
VDD rate of rise
0.05
V/ms see note 2
Average supply current, IDD
1.0
2.4
mA _{see note 3}
Input low voltage
VSS
0.15 VDD
V
Input high voltage
0.85 VDD
VDD
V
Output low voltage
0.6
V Current (sink) = 8.7mA
Output high voltage
Rx pin input current
VDD - 0.7
-0.5
V Current (source) = 5.4mA
+0.5
mA see note 4
RS232 baud rate
9600
baud see note 5
Notes:
1. This integrated circuit is produced with a Microchip Technology Inc.’s PIC12C5XX 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 Rx 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 a 3.58 MHz crystal is used as the frequency reference. Data is transferred
to and from the ELM320 with 8 data bits, no parity, and 1 stop bit (8 N 1).
ELM320DSC
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