N27 Hardware User Guide
Chapter 4 Application Interfaces
Copyright © Neoway Technology Co., Ltd. All rights reserved.
36
Figure 4-17 SPI timing
T
t(mov)
t(mis)
t(mih)
SPI_CS_N
SPI_CLK
SPI_MOSI
SPI_MISO
Table 4-3 Timing parameters of SPI interface
Timing Parameter
Minimum Value
Typical Value
Maximum Value Unit
T
Clock cycle (max.
50MHz)
20.0
/
/
ns
t(ch)
Clock high time
9.0
/
/
ns
t(cl)
Clock low time
9.0
/
/
ns
t(mov)
Output valid time
-5.0
/
5.0
ns
t(mis)
Input set-up time
5.0
/
/
ns
t(mih)
Input hold time
1.0
/
/
ns
4.3.6 I2C
Signal
Pin
I/O
Function
Remarks
I2C2_SCL
1
12
DO
I2C clock
Software (open) version: used as
I2C2_SCL. Connect this pin to 1.8 V by
using an external 2.2 kΩ pull-up resistor.
Leave this pin floating if it is not used.
I2C2_SDA
1
11
B
I2C data
Software (open) version: used as
I2C2_SDA. Connect this pin to 1.8 V by
using an external 2.2 kΩ pull-up resistor.
Leave this pin floating if it is not used.
N27 provides one standard I2C interface, which supports master mode only. The interface complies
with I2C Specification, version 5.0, October 2012.
I2C operates at 1.8V and does not embed an internal pull-up resistor. It is recommended to connect it
to 1.8V or VDDIO_1P8 thr
ough a 2.2 kΩ pull-up resistor.
