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AN2512 Datasheet(PDF) 10 Page - STMicroelectronics

Part # AN2512
Description  This application note describes how to design
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2512 Datasheet(HTML) 10 Page - STMicroelectronics

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Application description
AN2512
10/38
Crosstalk is minimized by means of good PCB planning and the proper use of filter
components in the crosstalk network. Recommended filter components are shown in
Figure 3. The network subtracts a signal proportional to the voltage input from the current
input. This prevents cross talking within the STPM01.
1.5
Clock management network
4.194 MHz quartz is used to supply the clock to the three STPM01 devices. Figure 4 shows
the schematic of the enhanced clock network which prevents EMI influences.
A discrete inverter network is used to change the impedance of the common node of the
three blocks. The output of the inverter prevents the second order antenna effect of the
node.
The CLKOUT pins are grounded to guarantee the current loop.
To select the measurement frequency range, MDIV must be set to 0 in the configuration
register of STPM01. If an 8 MHz quartz is used, this bit must be changed to 1.
Figure 4.
Clock management network schematic
PHASE_2
PHASE
SDA
SCS
SCL
SYN
N
P
GND
VDD
LED
VOTP
CLKIN
CLKOUT
PHASE_3
PHASE
SDA
SCS
SCL
SYN
N
P
GND
VDD
LED
VOTP
CLKIN
CLKOUT
PHASE_1
PHASE
SDA
SCS
SCL
SYN
N
P
GND
VDD
LED
VOTP
CLKIN
CLKOUT
VDD
VDD
VDD
VOTPL1
SCSL1
P1
N
N
VOTPL3
LEDL3
P3
SCSL3
LEDL1
SCL
SDA
N
SCL
CLKIN
SYN
LEDL2
SYN
SYN
P2
VOTPL2
SDA
SDA
SCL
SCSL2
U8B
74HC14A/SO
C2
15pF
C1
15pF
Y1
4.194304MHz
R1
1M
U8A
74HC14A/SO
1
2



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