STEVAL-IPE010V1 STMicroelectronics, STEVAL-IPE010V1 Datasheet - Page 65

• Manufacturer Part Number: STEVAL-IPE010V1
• Description: KIT DEMO ENERGY METER STPMC1/S1
• Manufacturer: STMicroelectronics
• Type: Other Power Managementr

Specifications of STEVAL-IPE010V1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: No
• Utilized Ic / Part: STPMC1, STPMS1
• Maximum Operating Temperature: + 85 C
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: STPMC1, STPMS1
• Other names: 497-10754

STPMC1
9.21.4
9.21.5
t
t
t
t
t
t
t
t
Interfacing the standard 3-wire SPI with STPMC1 SPI
Due to the fact that a 2-wire SPI is implemented in the STPMC1, it is clear that sending any
command from a standard 3-wire SPI would require 3-wire to 2-wire interface, which should
produce a proper signal on SDATD from host signals SDI, SDO and SYN. A single gate 3-
state buffer could be omitted by an emulation of SPI just to send some command. On a
microcontroller this would be done by the following steps:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. enable the SPI module
In case of precharge command (0xFF), emulation above is not necessary. Due to the pull up
device on the SDATD pin of the STPMC1 the processor needs to perform the following
steps:
1.
2.
3.
4.
5.
6.
Permanent writing of the CFG bits
In order to make a permanent set of some CFG bits, the following procedure should
be conducted:
3
4
3
3
5
6
8
9
: data value is placed in SDA
: SDA value is stable and shifted into the device
: end of SPI writing
: SPI enters idle state
−>
−>
−>
−>
disable the SPI module
set SDI pin which is connected to SDATD to be output
activate SYN first and then SCS
apply new bit value to SDI and activate SCL
deactivate SCL
repeat the last two steps seven times to complete one byte transfer
repeat the last three steps for any remaining byte transfer
set SDI pin to be input
deactivate SCS and the SYN
activate SYN first in order to latch the result;
after at least 1 s activate SCS
write one byte to the transmitter of SPI (this produces 8 pulses on SCL with SDI = 1)
deactivate SYN
optionally read the data records (the sequence of reading is altered
deactivate SCS
t
t
t
t
5
5
6
7
: 1 bit data value
: 6 bits address of the destination latch
: 1 bit EXE command
(> 10 µs): writing clock period
Doc ID 15728 Rev 4
Theory of operation
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