參數(shù)資料
型號(hào)： FTF1100MF1
廠商： INFINEON TECHNOLOGIES AG
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, XMA
文件頁(yè)數(shù)： 17/39頁(yè)
文件大?。?/td> 400K
代理商： FTF1100MF1
FingerTIP
Infineon Technologies
24/38
FTF 1100 MF1 V2.0 databook 3.3 (05.00)
4.3 SPI Protocol and Timing
The following figures 11a and 11b show the SPI protocol and timing for sending a
command and receiving the response. The timing parameters are shown in table 7 .
The FingerTIP must be selected, otherwise no commands will be accepted. To select
the sensor, first set SCK to low and than set Chip Select (/CS, low active) to low.
With the rising edge of the SCK, the sensor reads in the command data on the Serial Input
(SI). The command data format is 8-bit, starting with the LSB. With the 8
th clock cycle, the
MSB of the command data will be read in and the first bit (LSB) of the response will be
output with the falling edge. Every new clock cycle outputs a new bit of the response (8
bits long) with the falling edge of SCK. If the MSB is output, SO is set to low. After /CS is
set to high, Serial Output (SO) is set to tristate. Between a command and its response it is
not allowed to deselect the sensor. Deselecting the FingerTIP interrupts the
command/response sequence.
Before a new command can be sent by the master, the sensor must be deselected and
then selected again.
Figure 11: SPI Protocol and Timing: (a) Send a Command (b) Receive the Response
MSB OUT
LSB OUT
t
CYC
t
HO
t
WL
t
WH
SCK
(Master)
SO
(Sensor)
SI
(Master)
CS
(Master)
MSB IN
tristate
8
9
16
t
SO
t
CS
t
LAG
t
TRI
low
Receive Response
b)
SCK
SO
SI
CS
tristate
LSB IN
MSB IN
t
LEAD
t
SU
t
RI
t
FI
t
H
t
LCS
LSB OUT
(Master)
(Sensor)
(Master)
1
2
8
Send Command
a)
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