ELM327_10 Datasheet, PDF (6/76 Pages) ELM Electronics – OBD to RS232 Interpreter

ELM327
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 current, IDD
normal
12
mA ELM327 device only - does not
include any load currents
low power
0.15
mA
Input logic levels
low
VSS
0.8
V Pins 5, 6, 7, and 24 only
high
3.0
VDD
V
Schmitt trigger
input thresholds
rising
2.9
4.0
V Pins 1, 11, 12, 13, 15 and 18 only
falling
1.0
1.5
V
Output low voltage
0.3
V current (sink) = 10 mA
Output high voltage
4.4
V current (source) = 10 mA
Brown-out reset voltage
4.11
4.33
4.55
V
A/D conversion time
9
msec see note 3
Pin 18 low level pulse duration to
128
wake the IC from Low Power mode
IgnMon debounce time
50
65
-
µsec
msec
AT LP to PwrCtrl output time
1.0
sec
LP ALERT to PwrCtrl output time
2.0
sec
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.
ELM327DSH
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
6 of 76