HAL810 Datasheet, PDF (25/30 Pages) Micronas – Programmable Linear Hall-Effect Sensor

DATA SHEET
HAL 810
5. Programming of the Sensor
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.
The bits in the serial telegram have a different bit time
for the V_DD-line and the output. The bit time for the
V_DD-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.
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.
5.2. Definition of the Telegram
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).
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.
– 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.
– Programming the EEPROM cells (see Fig. 5–4)
After evaluating this command, the sensor answers
with the Acknowledge Bit. After the delay time t_w,
the supply voltage rises up to the programming volt-
age.
t_r
t_f
V_DDH
logical 0
t_p0
or
t_p0
V_DDL
V_DDH
logical 1
V_DDL
t_p0
t_p1
t_p1
or
t_p0
Fig. 5–1: Definition of logical 0 and 1 bit
Table 5–1: Telegram parameters
Symbol
Parameter
Pin
V_DDL
Supply Voltage for Low Level
1
during Programming
V_DDH
Supply Voltage for High Level
1
during Programming
t_r
Rise Time
1
t_f
Fall Time
1
t_p0
Bit Time on V_DD
1
t_pOUT
Bit Time on Output Pin
3
t_p1
Voltage Change for Logical 1
1, 3
V_DDPROG
Supply Voltage for
1
Programming the EEPROM
t_PROG
t_rp
t_fp
t_w
Programming Time for EEPROM
1
Rise Time of Programming Voltage
1
Fall Time of Programming Voltage
1
Delay Time of Programming Voltage 1
after Acknowledge
Min.
5
Typ.
5.6
Max.
6
Unit
V
Remarks
6.8
8.0
8.5
V
−
−
0.05 ms
−
−
0.05 ms
1.7
1.75 1.8
ms
2
3
4
ms
50
65
80
%
12.4 12.5 12.6 V
t_p0 is defined through the Sync Bit
t_pOUT is defined through the
Acknowledge Bit
% of t_p0 or t_pOUT
95
100
105
ms
0.2
0.5
1
ms
0
−
1
ms
0.5
0.7
1
ms
Micronas
Feb. 6, 2009; DSH000034_003EN
25