Product Specs

Table Of Contents
32 SPIS Serial peripheral interface slave with
EasyDMA
Page
303
RT
NT
CL
NT
32.6 Electrical specification
32.6.1 SPIS slave interface electrical specifications
Symbol
Description
Min.
Typ.
Max.
Units
f
SPIS
Bit rates for SPIS
27
8
28
Mbps
I
SPIS,2Mbps
Run current for SPIS, 2 Mbps
45
µA
I
SPIS,8Mbps
Run current for SPIS, 8 Mbps
45
µA
I
SPIS,IDLE
Idle current for SPIS (STARTed, no CSN activity)
1
µA
t
SPIS,LP,START
Time from RELEASE task to ready to receive/transmit (CSN
active), Low power mode
t
SPIS,CL,STA
+
µs
t
START_HFI
t
SPIS,CL,START
Time from RELEASE task to receive/transmit (CSN active),
Constant latency mode
0.125
µs
32.6.2 Serial Peripheral Interface Slave (SPIS) timing specifications
Symbol
Description
Min.
Typ.
Max.
Units
t
SPIS,CSCKIN,8Mbps
SCK input period at 8Mbps
125
ns
t
SPIS,CSCKIN,4Mbps
SCK input period at 4Mbps
250
ns
t
SPIS,CSCKIN,2Mbps
SCK input period at 2Mbps
500
ns
t
SPIS,RFSCKIN
SCK input rise/fall time
30
ns
t
SPIS,WHSCKIN
SCK input high time
30
ns
t
SPIS,WLSCKIN
SCK input low time
30
ns
t
SPIS,SUCSN,LP
CSN to CLK setup time, Low power mode
t
SPIS,SUCSN,
+
ns
t
START_HFI
t
SPIS,SUCSN,CL
CSN to CLK setup time, Constant latency mode
1000
ns
t
SPIS,HCSN
CLK to CSN hold time
2000
ns
t
SPIS,ASO
CSN to MISO driven
a
1000
ns
t
SPIS,DISSO
CSN to MISO disabled
a
68
ns
t
SPIS,CWH
CSN inactive time
300
ns
t
SPIS,VSO
CLK edge to MISO valid
19
ns
t
SPIS,HSO
MISO hold time after CLK edge
18
29
ns
t
SPIS,SUSI
MOSI to CLK edge setup time
59
ns
t
SPIS,HSI
CLK edge to MOSI hold time
20
ns
CSN (in)
CPOL=0
CPHA=0
CPOL=1
CPHA=0
MISO (out)
MOSI (in)
Figure 75: SPIS timing diagram
27
Higher bit rates may require GPIOs to be set as High Drive, see GPIO chapter for more details.
28
The actual maximum data rate depends on the master's CLK to MISO and MOSI setup and hold timings.
a
At 25pF load, including GPIO capacitance, see GPIO spec.
29
This is to ensure compatibility to SPI masters sampling MISO on the same edge as MOSI is output
t
SUCSN
t
CSCKIN
t
HCSN
t
CWH
t
WHSCKIN
t
WLSCKIN
t
RSCKIN
t
FSCKIN
t
ASO
t
VSO
MSb
t
HSO
t
DISSO
LSb
t
SUSI
t
HSI
MSb
LSb
SCK (in)