tle4982c Infineon Technologies Corporation, tle4982c Datasheet - Page 5

• Manufacturer Part Number: tle4982c
• Description: Programmable True Power On Hall Sensor
• Manufacturer: Infineon Technologies Corporation

Long reset:
This reset means a total reset of the analogue as well as for the digital part of the IC.
The output is forced to its default state (“high”). This condition remains for less than
1ms. After this time the IC is assumed to run in a stable condition and enters the initial
mode where the output represents the state of the target wheel (PROM value).
The following conditions lead to a long reset:
• Power-on condition.
• Low supply voltage: drop of the supply voltage to values less than 2.4V for a time
Short reset:
This reset means a reset of the digital circuitry. The output memorizes the state he had
before the reset. This condition remains for approx. 1µs. After that time the chip is
brought into the initial mode (output stays “high” for approx. 200µs for an untrimmed IC).
Then the output is released again and represents the state of the target wheel (PROM
value).
The following conditions lead to a short reset:
• If there are four min- or max-events found without a switching event at the output
Software reset:
This reset can be performed in the testmode through the serial-interface. The IC output
is then used as data output for the serial interface.
The following condition lead to a software reset:
• There is a reset applied through the serial Interface
Table 1 shows an overview over the behaviour of the output under certain conditions.
Q
normal TPO … “low” if B>B
inverted TPO … “high” if B>B
normal
inverted
precalibrated mode
output hold mode
n-1
calibrated mode
longer than 1µs .. 2µs or drop of the supply voltage to values less than 2.0V.
initial mode
short reset
long reset
… state of output before a reset occurs
… “low” if B>B
… “high” if B>B
Table1: Output behaviour under certain conditions
Noninverted
calibration)
high (self
Normal
Normal
High
High
Q
TPO
Threshold
n-1
TPO
Threshold
Unprogrammed
; “high” if B<B
; “low” if B<B
; “high” if B<B
; “low” if B<B
Page 5 of 28
inverted
-
-
-
-
-
-
TPO
TPO
Threshold
Threshold
normal TPO
Noninverted
normal TPO
Normal
Normal
High
Q
n-1
Programmed
inverted TPO
inverted TPO
Inverted
Inverted
Inverted
High
Q
n-1