ATRF4CE-EK Atmel, ATRF4CE-EK Datasheet - Page 25

• Manufacturer Part Number: ATRF4CE-EK
• Description: Development Boards & Kits - Wireless RF4CE evaluation kit
• Manufacturer: Atmel

Specifications of ATRF4CE-EK

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: ATmega128RFA1
• Core: AVR
• Frequency: 2.4 GHz
• Operating Supply Voltage: 3 V
• Description/function: Kit contains two radio controller boards assembled with the ATmega128RFA1 and a SMA connector at the RF port
• Factory Pack Quantity: 1

Failure Rate
where,
Example Calculation
HTOL (High Temperature Operating Life) testing at 125°C for 1,000 hours on a particular device results in 1 failure
(charge gain) out of a sample size of 500 units. The corresponding activation energy for charge gain is known to be
0.5 eV (Voltage Acceleration constant = 1.0). The power dissipation for the device is identical under field and stress
conditions (.15W). The junction temperature rise for the package is 20°C/W. The stress and nominal Voltage levels are
6.5 V and 5.0 V respectively. The field operating temperature is known to be 55°C.
The thermal and Voltage acceleration factors are computed as follows:
Therefore,
The failure rate in FITS (with 60% confidence) is calculated as:
Chi-Square Failure Estimate Reference
Atmel Quality Handbook

2

DH
n
=
=
=
=
=
Number of Failures
Failure Rate (Failure UnITs = Failures/109 Device Hours)
Failure Estimate
Confidence Level (60% or 90%)
Number of Failures
Device Hours
0
1
2
3
4
5
6
7
8
9
TAF
=
e
λ
. 8
617
Chi-Square (60% Conf.)
=
VAF
0
5 .
FA
⋅
2
10
1 0
A F
⋅
−
9 5 (
5
95
λ
=
⋅
=




10.47
12.58
14.69
16.78
18.87
20.95
.
1.83
4.04
6.21
8.35
=
328
e
) 9
21
2 1
4
1
0 .
0 4 .
χ
04
⋅
+
3 .
, 1 (
⋅
1 (
0 (
2
[
1
6
⋅
⋅
000
−
1 5 .
10
1 0
2
15 20
5 .
4
100
⋅
5 .
α
−
⋅
A F
9
AF DH
2 0
5
)
2 ,
0 .
=
⋅
)
]
(
⋅
−
n
95
500
⋅
9 5
=
+
D H
398
) 2
4
9 .
)
+
5 .
⋅
Chi-Square (90% Conf.)
10
1 0
0 (
=
1
1 5 .
15 20
9
4 2
42
⋅
2 0
FITS
)
25.99
28.41
10.64
13.36
15.99
18.55
21.06
23.54




4.61
7.78
=
21
2 1
3 .
25