Datasheet

CTI – SOFTWARE DEVELOPMENT GROUP
© 2008 Electrolux Major Appliances Europe, All rights reserved
33
File: AMI technical Guide v1.pdf - Date: 04/02/2008
6. ELECTRICAL CHARACTERISTICS
This chapter provides detailed information about the typical electrical characteristics of the AMI
module. CTI performed the electrical characterization on an AMI version 3 module with 8-Way plug.
Please remember that the actual characteristics may slightly change among different samples.
6.1. POWER SUPPLY
The maximum absolute range for the external power supply is from 7.5VDC to 12VDC
unregulated.
The recommended power supply value is 9VDC unregulated.
AMI module automatically uses the external power supply when you connect the corresponding
connector.
6.2. TYPICAL OUTPUT POWER – Absolute maximum ratings
AMI is able to provide to the target board a regulated +5VDC power supply. The maximum
current that is possible to absorb from the interface is determined by AMI internal circuit and
power supply mode:
 External power supply: MAX253 maximum power consumption, LM340MP-5 and
LE50ABZ output current limit values like explained hereafter.
6.2.1. AMI Power in:
LM340MP-5 (National Semiconductor) voltage regulator: package SOT-223. Datasheet
parameters:
• T
J
range : 0 ÷125 °C
• T
A
range : 0 ÷125 °C
• Thermal shutdown occurs if T
DIE
> 150°C
• Input voltage required to maintain line regulation: minimum 7.5V (@T
J
= 25°C, I
O
<1A)
for V
OUT
=+5V and V
IN
=+10V (nominal). So this value cannot be considered valid in
general but may vary depending on test situation or sample under test
• The maximum allowable power dissipation at any ambient temperature is a function of
the maximum junction temperature for operation (here T
JMAX
= 125°C), the junction-to-
ambient thermal resistance (θ
JA
), and the ambient temperature (T
A
) according to:
(
)
JMAX A
DMAX
JA
T-T
P =
θ
If this dissipation is exceeded, the die temperature will rise above T
JMAX
and the electrical
specifications do not apply
• If SOT-223 is used, the junction-to-ambient thermal resistance θ
JA
is 174°C/W
• It’s supposed a standard T
A
of 25°C