HAL856 Datasheet, PDF (26/42 Pages) Micronas – Programmable Linear Hall-Effect Sensor with Arbitrary Output Characteristic (2-Wire)

HAL 856
DATA SHEET
3.6.1. Specification of Biphase-M Output
In case of output format Biphase-M, a continuous data
stream is provided. It consists of:
– 1 SYNC bit defining the bit time t_p0,
– 14 data bits (DAT)
– 1 parity bit (DP)
– a gap (signal quiescent) of 8 x t_p0
The complete signal period is T = 24 x t_p0.
The signal quiescent level and the polarity of the
SYNC bit is shown in Fig. 3–9.
Type
HAL856
SYNC Bit Polarity
positive
Definition of Biphase-M Pulses
A logical “0” is coded as no output level change within
the bit time. A logical “1” is coded as an output level
change between 50% and 80% of the bit time. After
each bit, an output level change occurs.
Data Bits (DAT)
The 12 MSB of the 14 data bits (DAT) contain the digi-
tal output reading.
Data Parity Bit (DP)
This parity bit is “1” if the number of zeros within the 14
data bits is even. The parity bit is “0” if the number of
zeros is odd.
Note: If the part number output is activated, the part
number will be transmitted 2 times after
power-up (see Fig. 4–5 on page 33). The first
Biphase-M protocol, respectively, the first PWM
period after power-up, is not valid.
HAL 856:
I_DD
SYNC BIT
DAT
DP
8 x t_p0
Fig. 3–9: Output format Biphase-M: continuous data stream
26
March 23, 2010; DSH000142_002EN
Micronas