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AS5045-ASST 数据表(PDF) 25 Page - ams AG

部件名 AS5045-ASST
功能描述  12-Bit Programmable Magnetic Rotary Position Sensor
PDF  47 Pages
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制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS5045-ASST 数据表(HTML) 25 Page - ams AG

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ams Datasheet
Page 25
[v2-01] 2017-Jul-13
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AS5045 − Detailed Description
Figure 25:
OTP Programming Connection of AS5045 (Shown with AS5045 Demoboard)
Analog Readback Mode
Non-volatile programming (OTP) uses on-chip zener diodes,
which become permanently low resistive when subjected to a
specified reverse current.
The quality of the programming process depends on the
amount of current that is applied during the programming
process (up to 130mA). This current must be provided by an
external voltage source. If this voltage source cannot provide
adequate power, the zener diodes may not be programmed
properly.
In order to verify the quality of the programmed bit, an analog
level can be read for each zener diode, giving an indication
whether this particular bit was properly programmed or not.
To put the AS5045 in Analog Readback Mode, a digital sequence
must be applied to pins CSn, PROG and CLK as shown in
Figure 26. The digital level for this pin depends on the supply
configuration (3.3V or 5V) (see 3.3V / 5V Operation).
The second rising edge on CSn (OutpEN) changes pin PROG to
a digital output and the log. high signal at pin PROG must be
removed to avoid collision of outputs (grey area in Figure 26).
The following falling slope of CSn changes pin PROG to an
analog output, providing a reference voltage Vref, that must be
saved as a reference for the calculation of the subsequent
programmed and unprogrammed OTP bits.
Following this step, each rising slope of CLK outputs one bit of
data in the reverse order as during programming
AS5045 Demoboard
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1 MagINCn
MagDECn
NC
NC
NC
Mode
VSS
Prog_DI
DO
CLK
CSn
PWM
NC
NC
VDD3V3
VDD5V
AS5045
IC1
+
7
2
3
4
5
6
1
10n
1µF
µC
Cap only required for
OTP programming
GND
PROG
CSN
DO
CLK
5VUSB
VDD3V3
VSS
+
10µF
2
3
1
GND
VSS
VPROG
7. 5 …8.0V
only required for
OTP programming
connect to USB
interface on PC
For programming,
keep these 6 wires
as short as possible!
max. length= 2inches (5cm)
22k
3V 3



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