Elm Electronics – Circuits for the Hobbyist

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ELM331

Electrical Characteristics

Absolute Maximum Ratings

Storage Temperature....................... -65°C to +150°C

Ambient Temperature with

Power Applied....................................-40°C to +85°C

Voltage on any other pin with

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.

3 of 4

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

Conditions

Units

3.0

5.0

5.5

V

0.05

V/ms

1.0

2.4

mA

0.6

2.4

mA

microcontroller. For further device specifications, and possibly clarification of those given, please refer to the

appropriate Microchip documentation.

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 LED or drive currents.

4. If a measured resistance is determined to be out of limits, the frequency of measurements is increased to

provide visual feedback as well as a faster recovery.

5. The value of the pullup resistance is supply and temperature dependent.

Ω. When C is chosen, select the pin 5 current

Ω.

Frequency of measurements

2.0

sec

see note 4

Input low voltage - reset pin

V

Input high voltage - reset pin

V

Output low voltage

0.6

V

Output high voltage

V

Current (sink) = 8.7mA

Current (source) = 5.4mA

Reset pin internal pullup resistance

300

470

600

K

Ω

see note 5

500

500,000

µs

see note 6

see note 2

ELM331DSB