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STPM32 Datasheet(PDF) 37 Page - STMicroelectronics

No. de pieza STPM32
Descripción Electrónicos  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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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 37 Page - STMicroelectronics

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DS10272 Rev 8
37/121
STPM32, STPM33, STPM34
Theory of operation
121
Figure 28. Power-on-reset sequence
The STPM3x also has an enable pin (EN) which works as follows:
EN is high: when the power is on and EN pin raises, the device is enabled and starts
after POR procedure as above described.
EN is low: when the power is on and EN pin has a transition high to low, the device is
disabled. It stops and the internal digital memory is deleted so a new initialization is
needed when EN goes back to high.
After POR, to ensure a correct initialization, it is necessary to perform a reset of DSP and
communication peripherals through three SYN pulses (see Section 8.6.1 on page 68) and
a single SCS pulse, as shown in the figure below. SCS pulse can be performed before or
after SYN pulses, but minimum startup time before reset (as indicated in Table 5 on
page 17) has to be respected.
Figure 29. Global startup reset
VDDA
LDR 3.0 V
LDR 1.2 V
VDDD
PowerOK_3.0 V
PowerOK_1.2 V
EN
POR
16 MHz Osc
XTAL2
XTAL1
VCC
OSC
CLKIN
GIPG1303141331LM



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