ELM621 데이터 시트보기 (PDF) - Elm Electronics

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ELM621

Serial three bit port.

Elm Electronics 

ELM621

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

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

Logical low input voltage

Logical high input voltage

Output low voltage

Output high voltage

Internal pullup resistances

(see note 3)

Rx pin input current

RS232 Baud Rate

VSS

0.85 VDD

VDD - 0.7

300

20

-0.5

500

30

9600

0.15 VDD

VDD

0.6

600

50

+0.5

V

V

V Current (sink) = 8.7mA

V Current (source) = 5.4mA

KΩ reset (Pin 4)

KΩ B3 (Pin 7) when enabled

mA see note 4

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.

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

4. This specification represents the current flowing through the protection diodes when applying large voltages

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

5. The RS232 baud rate is derived from an internal oscillator that can typically vary by about ±3% over the full

temperature range with VDD = 5V. Data is transferred to and from the ELM621 with 8 data bits, no parity,

and 1 stop bit (8 N 1).

ELM621DSA

Elm Electronics – Circuits for the Hobbyist

< http://www.elmelectronics.com/ >

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