DATA SHEET
HAL810
5. Programming of the Sensor
– Read a register (see Fig. 5–3)
After evaluating this command, the sensor answers
with the Acknowledge Bit, 14 Data Bits, and the
Data Parity Bit on the output.
5.1. Definition of Programming Pulses
The sensor is addressed by modulating a serial tele-
gram on the supply voltage. The sensor answers with
a serial telegram on the output pin.
– Programming the EEPROM cells (see Fig. 5–4)
After evaluating this command, the sensor answers
with the Acknowledge Bit. After the delay time tw,
the supply voltage rises up to the programming volt-
age.
The bits in the serial telegram have a different bit time
for the VDD-line and the output. The bit time for the
VDD-line is defined through the length of the Sync Bit
at the beginning of each telegram. The bit time for the
output is defined through the Acknowledge Bit.
t
t
f
r
V
DDH
t
t
p0
p0
A logical “0” is coded as no voltage change within the
bit time. A logical “1” is coded as a voltage change
between 50% and 80% of the bit time. After each bit, a
voltage change occurs.
logical 0
or
V
V
DDL
DDH
t
p1
5.2. Definition of the Telegram
t
t
p0
p0
logical 1
or
Each telegram starts with the Sync Bit (logical 0),
3 bits for the Command (COM), the Command Parity
Bit (CP), 4 bits for the Address (ADR), and the
Address Parity Bit (AP).
t
V
p1
DDL
Fig. 5–1: Definition of logical 0 and 1 bit
There are different telegram formats:
– Write a register (see Fig. 5–2)
After the AP Bit, follow 14 Data Bits (DAT) and the
Data Parity Bit (DP). If the telegram is valid and the
command has been processed, the sensor answers
with an Acknowledge Bit (logical 0) on the output.
Table 5–1: Telegram parameters
Symbol
Parameter
Pin
Min.
Typ.
Max.
Unit
Remarks
V
Supply Voltage for Low Level
during Programming
1
5
5.6
6
V
DDL
V
Supply Voltage for High Level
during Programming
1
6.8
8.0
8.5
V
DDH
t
t
t
t
Rise Time
Fall Time
1
1
1
3
−
−
0.05
0.05
1.8
4
ms
ms
ms
ms
r
−
−
f
Bit Time on V
1.7
2
1.75
3
t
is defined through the Sync Bit
p0
p0
DD
Bit Time on Output Pin
t
is defined through the
pOUT
pOUT
Acknowledge Bit
t
Voltage Change for Logical 1
1, 3
1
50
65
80
%
V
% of t or t
p1
p0
pOUT
V
Supply Voltage for
12.4
12.5
12.6
DDPROG
Programming the EEPROM
t
t
t
t
Programming Time for EEPROM
Rise Time of Programming Voltage
Fall Time of Programming Voltage
1
1
1
1
95
0.2
0
100
0.5
−
105
1
ms
ms
ms
ms
PROG
rp
fp
w
1
Delay Time of Programming Voltage
after Acknowledge
0.5
0.7
1
Micronas
Feb. 6, 2009; DSH000034_003EN
25
MICRONAS [ MICRONAS ]
