atr2434 ATMEL Corporation, atr2434 Datasheet - Page 29

• Manufacturer Part Number: atr2434
• Description: Wirelessusb 2.4-ghz Dsss Radio Soc - Atmel Corporation
• Manufacturer: ATMEL Corporation

AC Characteristics
Figure 9. SPI Timing Diagram
Figure 10. SPI Burst Read Every 9th SCK HI Stretch Timing Diagram
4822C–ISM–09/04
Description
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
SPI slave select hold time after last negative edge of
SCK
Notes:
(4)
M ISO
SCK
M O S I
M IS O
S C K
1. AC values are not guaranteed if voltages on any pin exceed V
2. This stretch only applies to every 9
3. For F
4. SCK must start low, otherwise the success of SPI transactions are not guaranteed.
SS
S S
OSC
t
D A T _ S U
t
= 13 MHz, 3.3 V at 25°C.
S S _ S U
data to mcu
d a ta fro m m cu
every 8
(1)
t
S CK_HI
: SPI Interface
th
SCK_HI
t
S C K _ H I
t
t
D A T _ H L D
SCK_CYC
t
S C K _ C Y C
t
D AT_VA L
th
t
SCK _LO
SCK HI pulse for SPI burst reads only.
t
S C K _ L O
(3)
t
D A T _ V A L
t
d a ta fro m m c u
data to mcu
SCK_HI (BURST READ)
d a ta to m c u
t
SCK _HI (BURS T RE AD)
Parameter
every 9
t
t
t
SCK_CYC
t
t
t
t
DAT_HLD
DAT_VAL
t
SCK_LO
SS_HLD
SCK_HI
DAT_SU
SS_SU
th
SCK _HI
CC
.
(2)
ATR2434 [Preliminary]
Min.
97
77
476
238
158
158
250
10
80
(3)
(3)
d a ta fro m m cu
d a ta to m c u
data to mcu
Typ.
every 10
th
SC K_HI
t
S S _ H L D
174
Max.
(3)
d a ta
d a ta
data
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
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