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MAS6505 数据表(PDF) 26 Page - Micro Analog systems

部件名 MAS6505
功能描述  Piezoresistive Sensor Signal Interface IC
PDF  44 Pages
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制造商  MAS [Micro Analog systems]
网页  http://www.mas-oy.com
标志 MAS - Micro Analog systems

MAS6505 数据表(HTML) 26 Page - Micro Analog systems

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DA6505.005
11 June 2018
26 (44)
CLOCK OSCILLATOR FREQUENCY TRIM REGISTER (FF/7FHEX)
Note that the internal clock oscillator frequency has
been factory trimmed and the trim value has been
stored
into
the
EEPROM
(BF/3FHEX).
It
is
recommended
not
to
change
the
factory
programmed value! See table 11.
The
Clock
oscillator
frequency
trim
register
(FF/7FHEX) is for trimming the internal clock oscillator
to 250 kHz frequency. By selecting ENTP=1 in the
Clock oscillator frequency trim register (FF/7FHEX)
and STEST=0001 and TRIM=11 in the Trim and test
register (FA/7AHEX) the internal oscillator is turned on
all the time and the 250 kHz oscillator signal can be
measured at the SDO pin and also adjusted by the
Clock oscillator frequency trim register.
The seven LSB bits adjust the oscillator signal period
in 35 ns steps. The signal period decreases and
frequency increases when the trim value increases.
The seven bits
register value is considered as a 2’s
complement number. Typically the mid value 00HEX
corresponds to 212 kHz clock oscillator frequency.
After finding a suitable trim value it can be stored into
the EEPROM (BF/3FHEX).
Table 11. Clock oscillator frequency trim register (FF/7FHEX)
Bit
Number
Bit
Name
Description
Value
(bin)
Value
(2’s complement)
Value
(dec)
Function
7
ENTP
Enable for
test pin
0
1
Disable test pin (default)
SDO is test pin if STEST<>0
6-0
OSCF
Clock
oscillator
frequency
control
0111111
0111110
…….
0000001
0000000
1111111
1111110
…….
1000001
1000000
63
62
…
1
0
-1
-2
…
-63
-64
63
62
…
1
0
127
126
…
65
64
Max frequency
…
…
…
212 kHz
…
…
…
…
Min frequency



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