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3.3.1
Data Frame
The structure of a data frame sent to the device is shown in
have to be set in the same way as for the command frame (bit 0 is the LSB, bit 20 is the MSB):
bit0 XOR bit2 XOR bit4 XOR .... XOR bit20 = 0
bit1 XOR bit3 XOR bit5 XOR .... XOR bit19 = 0
MSB (bit 20)
P
P
1
0
O
E
Figure 3-6 Data Frame to Sensor
Figure 3-7
shows a the structure data frame received from the sensor. Instead of a zero bit followed by two parity
bits, the least significant 3 bits of the address used for the readout are transmitted together with the data. This is
to check the plausibility of the received data.
MSB (bit 20)
1
ADR (3 LSBs)
Figure 3-7 Data Frame from Sensor
3.3.2
Interface Specification
Table 3-3
specifies the operating conditions of the programming interface, which must be met in order to ensure
correct operation of the TLE4997 during programming. All specified parameters refer to these operating
conditions, unless otherwise noted.
Table 3-3
Operating Range of the Programming Interface
Parameter
Supply voltage
Supply buffer capacitance C
Load capacitance
Ambient temperature
Number of programming
cycles
Programming time
Programming start time
1) >47nF soldered to the device required in case that connectivity failures can influence the programming voltage.
The specification for timings and electrical levels of the programming interface is shown in
of the timing parameters is illustrated in
User's Manual
Symbol
Min.
Typ.
V
4.5
–
DD
47
–
S
1)
C
0.0
–
L
T
10
–
PRG
N
PRG
t
–
100
PRG
t
–
–
PRG_START
Figure
3-8.
Figure
3-6. The parity bits PE (bit 17) and PO (bit 18)
DATA (16bit)
DATA (16bit)
Values
Unit
Max.
5.5
V
1000
nF
210
nF
60
°C
10
Cycles Programming is allowed only at
–
ms
19
ms
8
User's Manual
TLE4997 Programming
Note / Test Condition
–
V
to GND
DD
OUT to GND
during programming
start of lifetime
For complete memory
To start programming mode, a
first read command shall be sent
within this time window after
power-up
Table
3-4. The meaning
v01_01, 2019-08
TLE4997
LSB (bit 0)
1
LSB (bit 0)
1
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