Operation Manual

Electrical Characteristics
7 of 94ELM327DSJ 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 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.
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 ConditionsUnits
Supply voltage, VDD 4.2 5.0 5.5 V
VDD rate of rise 0.05 V/ms
Average current, IDD 12 mA
Input logic levels 0.8
3.0
V
Output low voltage
Output high voltage
current (sink) = 10 mA
current (source) = 10 mA
see note 2
AT RV to beginning of response
ELM327 device only - does not
include any load currents
Schmitt trigger
input thresholds
Brown-out reset voltage 2.65 2.79 2.93 V
rising
falling
A/D conversion time 9 msec
Pins 5, 6, 7, and 24 only
V
V
0.3
4.4
V
V
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
50
1.0
0.15 mA
normal
low power
Pin 18 wake pulse duration µsec128
65
low
high VVDD
VSS
to wake from Low Power mode
Reset time AT Z
AT WS
msec
msec
800
2
Measured from the end of the
command to the start of the ID
message (ELM327 v2.1)