71M6531D_10 Datasheet, PDF (51/120 Pages) Teridian Semiconductor Corporation – Energy Meter IC

FDS 6531/6532 005
Name
SPI0
SPI1
VERSION
CHIP_ID
TRIMSEL
TRIMX
TRIM
Data Sheet 71M6531D/F-71M6532D/F
Address (hex)
20B0
20B1
20C8
20C9
20FD
20FE
20FF
Bit Range
4, 0
4, 0
7:0
7:0
4:0
0
7:0
Read/Write
RW
R
R
R
RW
RW
RW
SERIAL READ
8 bit CMD
16 bit Address
DATA[ADDR]
DATA[ADDR+1]
PCSZ
0
PSCK
(From Host) PSDI x C7 C6 C5
(From 6531) PSDO
78
C0 A15 A14
HI Z
23 24
A1 A0
x
D7 D6
Extended Read . . .
31 32
39
D1 D0 D7 D6
D1 D0
SERIAL WRITE
8 bit CMD
16 bit Address
DATA[ADDR]
DATA[ADDR+1]
PCSZ
0
PSCK
78
23 24
Extended Write . . .
31 32
39
(From Host) PSDI x C7 C6 C5
(From 6531) PSDO
C0 A15 A14
A1 A0 D7 D6
HI Z
D1 D0 D7 D6
D1 D0 x
Figure 16: SPI Slave Port: Typical Read and Write operations
Possible applications for the SPI interface are:
1) An external host reads data from CE locations to obtain metering information. This can be used in
applications where the 71M6531D/F or 71M6532D/F function as smart front-ends with preprocessing
capability. Since the addresses are in 16-bit format, any type of XRAM data can be accessed: CE,
MPU, I/O RAM, but not SFRs or the 80515-internal register bank.
2) A communication link can be established via the SPI interface: By writing into MPU memory locations,
the external host can initiate and control processes in the MPU of the 71M6531D/F or 71M6532D/F.
Writing to a CE or MPU location normally generates an interrupt, a function that can be used to signal
to the MPU that the byte that had just been written by the external host must be read and processed.
Data can also be inserted by the external host without generating an interrupt.
3) An external DSP can access front-end data generated by the ADC. This mode of operation uses the
71M6531D/F or 71M6532D/F as an analog front-end (AFE).
v1.3
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