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STPM32 Datasheet(PDF) 36 Page - STMicroelectronics

Part # STPM32
Description  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
PDF  121 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 36 Page - STMicroelectronics

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Theory of operation
STPM32, STPM33, STPM34
36/121
DS10272 Rev 8
CLKOUT pin can be used to feed another STPM3x device clock with 16 MHz, when multiple
STPM3x are used in cascade as shown in Figure 27.
Figure 27. Clock feed for multiple devices
8.2.4
Power-on-reset (POR) and enable (EN)
The STPM3x contains a power-on-reset (POR) circuit which delays the startup of the digital
domain about 750 μs. If VCC supply is less than 2.5 V the STPM3x goes to the inactive
state, all functions are blocked asserting a reset condition. This is useful to assure the
correct device operation during the power-up and power-down.
POR sequence is illustrated in Figure 28: after the start of two LDOs and internal PowerOK
signals are asserted, the analog block first and the digital block after start the processing.
Table 11. Clock tree
CLK name
Name
Typical value
Description
Input clock
CLKIN
16 MHz
External clock
Master clock
MCLK
4 MHz
Master root clock
Analog sampling
clock
SCLK
4 MHz
OSF of sigma-delta modulators
Decimated clock
DCLK
7.8125 kHz
Sampling frequency of instantaneous voltage and
current values
CLKIN/XTAL2
XTAL1
CLKOUT/ZCR
CLKIN/XTAL2
XTAL1
CLKOUT/ZCR
15 pF
15 pF
1MΩ
CLKIN/XTAL2
XTAL1
CLKOUT/ZCR
GIPG2503141257LM



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