HAR2425 datasheet(14/33 Pages) MICRONAS

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HAR 24xy

DATA SHEET

July 14, 2015; DSH000170_001EN

Micronas

Analog Output Signal Scaling with DAC_GAIN/

DAC_OFFSET (HAR 2425)

The required output voltage range of the analog output

is defined by the registers DAC_GAIN (Gain of the out-

put) and DAC_OFFSET (Offset of the output signal).

Both register values can be calculated based on the

angular range and the required output voltage range.

They have a bit length of 16 bit and are two’s-comple-

mented coded.

Output Signal Scaling with DAC_GAIN/

DAC_OFFSET (HAR 2455)

The required output duty cycle of the output is defined

by the registers DAC_GAIN (Gain of the output) and

DAC_OFFSET (Offset of the output signal). Both regis-

ter values can be calculated based on the angular

range and the required output PWM duty cycle range.

They have a bit length of 16 bit and are two’s-comple-

mented coded.

Clamping Levels

The clamping levels DAC_CMPHI and DAC_CMPLO

define the maximum and minimum output voltage of

the analog output. The clamping levels can be used to

define the diagnosis band for the sensor output. Both

registers have a bit length of 16 bit and are two’s-com-

plemented coded. Both clamping levels can have val-

ues between 0% and 100% of VSUP.

3.2.2.3. NVRAM Registers

Customer Setup

The CUST_SETUP register is a 16 bit register that

enables the customer to activate various functions of

the sensor like, customer burn-in mode, diagnosis

modes, functionality mode, customer lock, etc.

The Output Short Detection feature is implemented to

detect a short circuit between two sensor outputs. The

customer can define how the sensor should signalize a

detected short circuit (see table above). The time inter-

val in which the sensor is checking for an output short

and the detectable short circuit current are defined in

Section 4.12. on page 27.

This feature should only be used in case that two sen-

sors are used in one module. In case that the Output

Short Detection is not active both sensors will try to

drive their output voltage and the resulting voltage will

be within the valid signal band.

Note: The Output Short Detection feature is only

active after setting the Customer Lock bit and a

power-on reset.

Table 3–3: Functions in CUST_SETUP register

Bit No.

Function

Description

None

Reserved

14:12

Barrel Shifter

Magnetic Range

(see Section Table 3–2: on

page 13)

11:10

None (HAR 2425)

Reserved

PWM frequency

setting (HAR 2455)

PWM frequency selection

(see Table 3–1 on page 11)

9:8

Output Short

Detection

0: Disabled

1: High & low side over current

detection -> OUT = VSUP in error

case

2: High & low side over current

detection -> OUT = GND in error

case

3: Low side over current detection ->

OUT = Tristate in error case

Error Band

(HAR 2425)

Error band selection for locked

devices (Customer Lock bit set).

0: High error band (VSUP)

1: Low error band (GND)

The sensor will always go to high

error band as long as it is not

locked (Customer Lock bit not set).

(see Section 4.13. on page 27)

PWM Output

Polarity (OP)

(HAR 2455)

0: PWM period starts with a high

pulse

1: PWM period starts with a low

pulse (effective after LC=1)

None

Reserved

Functionality

Mode

Supply voltage supervision

0: extended: undervoltage (POR)

3.8 V, overvoltage 9 V

1: normal: undervoltage (POR)

4.2 V, overvoltage 6 V

Communication

Mode (POUT)

Communication via output pin

0: Disabled

1: Enabled

Overvoltage

Detection

0: Overvoltage detection active

1: Overvoltage detection disabled

Diagnosis Latch

Latching of diagnosis bits

0: No latching

1: Latched till next POR (power-on

reset)

Diagnosis

(HAR 2425)

0: Diagnosis errors force output to

the selected error band

1: Diagnosis errors do not force

output to the selected error band

Diagnosis

(HAR 2455)

0: Diagnosis errors force the PWM

output into error mode (see

Table 3–5 on page 18)

1: Diagnosis errors do not force

the PWM output into error mode

Customer Lock

Bit must be set to 1 to lock the

sensor memory

Table 3–3: Functions in CUST_SETUP register

Bit No.

Function

Description

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