mfrc522 NXP Semiconductors, mfrc522 Datasheet - Page 90

• Manufacturer Part Number: mfrc522
• Description: Contactless Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
112132
Product data sheet
23.8 Timing for the SPI compatible interface
Table 174: Timing Specification for SPI
Symbol
t
t
t
t
t
t
SCKL
SCKH
SHDX
DXSH
SLDX
SLNH
Fig 30. Timing Diagram for SPI.
SCK
MOSI
MISO
NSS
Remark: The signal NSS has to be low to be able to send several bytes in one datastream.
To send more than one datastream NSS has to be set to HIGH level in between the data
streams.
Parameter
SCK low pulse width
SCK high pulse width
SCK high to data changes
data changes to SCK high
SCK low to data changes
SCK low to NSS high
t
Rev. 3.2 — 22 May 2007
SCKL
t
DXSH
MSB
MSB
Conditions
t
t
SCKH
SHDX
t
SLDX
t
t
SCKL
DXSH
Min
50
50
25
25
-
0
Contactless Reader IC
Typ
MFRC522
© NXP B.V. 2007. All rights reserved.
t
SLNH
Max
-
-
-
-
25
-
LSB
LSB
90 of 109
Unit
ns
ns
ns
ns
ns
ns