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ADE7978 데이터시트(PDF) 11 Page - Analog Devices

부품명 ADE7978
상세설명  Isolated Energy Metering Chipset for Polyphase Shunt Meters
PDF  120 Pages
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Data Sheet
ADE7978/ADE7933/ADE7932
Rev. 0 | Page 11 of 120
SPI Interface Timing Parameters
VDD = 3.3 V ± 10%, GND = DGND = 0 V, XTALIN = 16.384 MHz, TMIN to TMAX = −40°C to +85°C.
Table 4.
Parameter
Symbol
Min
Max
Unit
SS to SCLK Edge
tSS
50
ns
SCLK Period
0.4
40001
μs
SCLK Low Pulse Width
tSL
175
ns
SCLK High Pulse Width
tSH
175
ns
Data Output Valid After SCLK Edge
tDAV
130
ns
Data Input Setup Time Before SCLK Edge
tDSU
100
ns
Data Input Hold Time After SCLK Edge
tDHD
50
ns
Data Output Fall Time
tDF
20
ns
Data Output Rise Time
tDR
20
ns
SCLK Rise Time
tSR
20
ns
SCLK Fall Time
tSF
20
ns
MISO Disable After SS Rising Edge
tDIS
1
μs
SS High After SCLK Edge
tSFS
100
ns
1 Guaranteed by design.
MSB
LSB
LSB IN
INTERMEDIATE BITS
INTERMEDIATE BITS
tSFS
tDIS
tSS
tSL
tDF
tSH
tDHD
tDAV
tDSU
tSR
tSF
tDR
MSB IN
MOSI
MISO
SCLK
SS
Figure 6. SPI Interface Timing



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