參數(shù)資料
型號: CYWUSB6935
廠商: Cypress Semiconductor Corp.
英文描述: WirelessUSB LR 2.4-GHz DSSS Radio SoC(WirelessUSB LR 2.4-GHz DSSS無線SoC)
中文描述: 的WirelessUSB LR 2.4 GHz的無線擴(kuò)頻系統(tǒng)芯片(的WirelessUSB LR 2.4 GHz的無線擴(kuò)頻芯片)
文件頁數(shù): 24/32頁
文件大?。?/td> 395K
代理商: CYWUSB6935
CYWUSB6935
Document #: 38-16008 Rev. *D
Page 24 of 32
12.0
AC Characteristics
[14]
Notes:
14. AC values are not guaranteed if voltages on any pin exceed V
.
15. This stretch only applies to every 9th SCK HI pulse for SPI Burst Reads only.
16. For F
= 13 MHz, 3.3V @ 25°C.
17. SCK must start low, otherwise the success of SPI transactions are not guaranteed.
Table 12-1. SPI Interface
[16]
Parameter
Description
Min.
476
238
158
158
10
97
[16]
77
[16]
250
80
Typ.
Max.
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
t
SCK_CYC
t
SCK_HI (BURST READ)[15]
t
SCK_HI
t
SCK_LO
t
DAT_SU
t
DAT_HLD
t
DAT_VAL
t
SS_SU
t
SS_HLD
SPI Clock Period
SPI Clock High Time
SPI Clock High Time
SPI Clock Low Time
SPI Input Data Set-up Time
SPI Input Data Hold Time
SPI Output Data Valid Time
SPI Slave Select Set-up Time before first positive edge of SCK
[17]
SPI Slave Select Hold Time after last negative edge of SCK
174
[16]
Figure 12-1. SPI Timing Diagram
Figure 12-2. SPI Burst Read Every 9th SCK HI Stretch Timing Diagram
data from mcu
MOSI
t
SCK_CYC
SCK
t
SCK_HI
t
SCK_LO
t
DAT_SU
t
DAT_HLD
MISO
SS
t
SS_SU
t
SS_HLD
t
DAT_VAL
data
data
SAMPLE
DRVE
data from mcu
data from mcu
data to mcu
data to mcu
data to mcu
MISO
t
SCK_CYC
SCK
t
SCK_HI
t
SCK_LO
SS
t
DAT_VAL
data
DRVE
data to mcu
data to mcu
every 8
th
SCK_HI
every 9
th
SCK_HI
every 10
th
SCK_HI
t
SCK_HI (BURST READ)
DRVE
DRVE
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