SM1211E915TOPIC Semtech, SM1211E915TOPIC Datasheet - Page 37

• Manufacturer Part Number: SM1211E915TOPIC
• Description: KIT PICTAIL EXT FOR SX1211
• Manufacturer: Semtech
• Type: Transceiver, UHFr

Specifications of SM1211E915TOPIC

• Frequency: 915MHz
• For Use With/related Products: SX1211
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Note that when reading more than one register successively, it is not compulsory to toggle NSS_CONFIG back
high between two read sequences. The bytes are alternatively considered as address and value.
To write bytes into the FIFO the timing diagram below should be carefully followed by the uC.
Note that it is compulsory to toggle NSS_DATA back high between each byte written.
The byte is pushed into the FIFO on the rising edge of NSS_DATA
Rev 7 – Sept 2
NSS_CONFIG (In)
SCK (In)
MOSI (In)
MISO (Out)
ADVANCED COMMUNICATIONS & SENSING
Write Byte (before/during Tx)
SCK (In)
MOSI (In)
MISO (Out)
NSS_DATA (In)
HZ
(input)
nd
, 2008
HZ
(input)
5.2.1.3. SPI Data
start
1
x
x
D1(7)
1
rw
D1(6) D1(5) D1(4)
2
x
2
x
A(4) A(3) A(2) A(1)
3
x
3
x
Figure 29: Write Bytes Sequence (ex: 2 bytes)
1
st
4
x
Address = A1
byte written
4
x
x
Figure 28: Read Register Sequence
D1(3) D1(2) D1(1)
5
x
5
x
6
x
6
x
7
x
A(0)
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7
D1(0)
x
8
x
stop
8
(input)
x
HZ
D(7) D(6) D(5) D(4) D(3) D(2) D(1)
x
9
D2(7) D2(6) D2(5)
x
1
10
x
2
x
11
x
3
x
Current value at
address A1
2
nd
D2(4)
12
x
4
x
byte written
D2(3) D2(2) D2(1)
5
x
13
x
6
x
14
x
7
x
15
x
D2(0)
8
x
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SX1211
16
D(0)
x
x
HZ
(input)
HZ
(input)