Cirrus Logic CS485xx - Manual (Page 13)

13 DS734F5
5.10 Switching Characteristics—Serial Control Port–SPI Master Mode
5.10 Switching Characteristics—Serial Control Port–SPI Master Mode
Figure 5-4. Serial Control Port–SPI Master Mode Timing
5.11 Switching Characteristics—Serial Control Port–I 2 C Slave Mode
Parameter Symbol Min Typical Max Units
SCP_CLK frequency 1
1.The specification f
spisck
indicates the maximum speed of the hardware. The system designer should be aware that the actual maximum speed of the
communication port may be limited by the firmware application.
f
spisck
— — F
xtal
/2 2
2.See Section 5.7 .
MHz
SCP_CS# falling to SCP_CLK rising 3
3.SCP_CLK PERIOD refers to the period of SCP_CLK as being used in a given application. It does not refer to a tested parameter.
t
spicss
— 11*DCLKP + (SCP_CLK PERIOD)/2 — ns
SCP_CLK low time t
spickl
20 — — ns
SCP_CLK high time t
spickh
20 — — ns
Setup time SCP_MISO input t
spidsu
13 — — ns
Hold time SCP_MISO input t
spidh
5 — — ns
SCP_CLK low to SCP_MOSI output valid t
spidov
— — 8 ns
SCP_CLK low to SCP_CS# falling t
spicsl
7 — — ns
SCP_CLK low to SCP_CS# rising t
spicsh
— 11*DCLKP + (SCP_CLK PERIOD)/2 — ns
Bus free time between active SCP_CS# t
spicsx
— 3*DCLKP — ns
SCP_CLK falling to SCP_MOSI output high-Z t
spidz
— — 20 ns
Parameter Symbol Min Typical Max Units
SCP_CLK frequency 1 f
iicck
— — 400 kHz
SCP_CLK low time t
iicckl
1.25 — — µs
SCP_CLK high time t
iicckh
1.25 — — µs
SCP_SCK rising to SCP_SDA rising or falling for START or STOP condition t
iicckcmd
1.25 — — µs
START condition to SCP_CLK falling t
iicstscl
1.25 — — µs
SCP_CLK falling to STOP condition t
iicstp
2.5 — — µs
Bus free time between STOP and START conditions t
iicbft
3 — — µs
Setup time SCP_SDA input valid to SCP_CLK rising t
iicsu
100 — — ns
Hold time SCP_SDA input after SCP_CLK falling t
iich
20 — — ns
EE_CS#
SCP_CLK
SCP_MISO
SCP_MOSI
0 1 2 6 7 0 5 6 7
t
spicss
t
spickl
t
spickh
t
spidsu
t
spidh t
spidov
A6 A5 A0 R/W MSB LSB
MSB LSB
t
spicsh
t
spicsx
f
spisck
t
spidz
t
spicsl