ST7LNB0V2Y0 STMicroelectronics, ST7LNB0V2Y0 Datasheet - Page 19

• Manufacturer Part Number: ST7LNB0V2Y0
• Description: DiSEqC™ 2.1 Slave Microcontroller for LNBs and Switchers
• Manufacturer: STMicroelectronics

ST7LNB0V2Y0
6.5.2
Table 18.
1. Data based on characterization results, not tested in production.
Symbol
S
EMI
Peak level
Parameter
Designing hardened software to avoid noise problems
EMC characterization and optimization are performed at component level with a typical
application environment and simplified MCU software. It should be noted that good EMC
performance is highly dependent on the user application and the software in particular.
Therefore it is recommended that the user applies EMC software optimization and
prequalification tests in relation with the EMC level requested for his application.
Most of the common failures (unexpected reset and program counter corruption) can be
reproduced by manually forcing a low state on the RESET pin or the Oscillator pins for 1
second.
To complete these trials, ESD stress can be applied directly on the device, over the range of
specification values. When unexpected behavior is detected, the software can be hardened
to prevent unrecoverable errors occurring (see application note AN1015).
Table 17.
Electromagnetic Interference (EMI)
Based on a simple application running on the product (toggling 2 LEDs through the I/O
ports), the product is monitored in terms of emission. This emission test is in line with the
norm SAE J 1752/3 which specifies the board and the loading of each pin.
EMI characteristics
Symbol
V
V
FESD
FFTB
Software recommendations:
The software flowchart must include the management of runaway conditions such as:
–
–
–
Prequalification trials:
Corrupted program counter
Unexpected reset
Critical Data corruption (control registers...)
Voltage limits to be applied on any I/O pin to
induce a functional disturbance
Fast transient voltage burst limits to be
applied through 100 pF on V
to induce a functional disturbance
V
SO16 package,
conforming to SAE J 1752/3
EMS characteristics
DD
=5 V, T
(1)
A
Conditions
=+25 °C,
Parameter
DD
and V
DD
0.1 MHz to 30 MHz
30 MHz to 130 MHz
130 MHz to 1 GHz
SAE EMI Level
pins
frequency band
Monitored
V
conforms to IEC 1000-4-2
V
conforms to IEC 1000-4-4
DD
DD
=5 V, T
=5 V, T
A
A
Conditions
=+25 °C, f
=+25 °C, f
Electrical characteristics
1/4MHz 1/8MHz
3.5
27
26
[f
8
Max vs.
OSC
OSC
OSC
/f
=8 MHz
=8 MHz
CPU
14
32
28
4
]
Level/
Class
dBµV
Unit
2B
3B
19/30
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