Freescale Semiconductor TWR-K65F180M, Руководство пользователя

Страница: 8 / 18

TWR-K65F180M User's Guide , Rev. 0 , 05/2015
8 Freescale Semiconductor, Inc.
3.8 SDRAM
The TWR-K65F180M board contains 64 Mb SDRAM (32-bit width) which is connected to the K65
SDRAM controller. The SDRAM signals are multiplexed with Flexbus signals. See the
K65 Family
Reference Manual (document K65P169M180SF5RMV2 ) “Flexbus signal multiplexing” section and
“SDRAM SDR signal multiplexing” section on how to use the Flexbus and SDRAM in multiplexed
mode.
3.9 Accelerometer
An MMA8451Q digital accelerometer is connected to the K65 MCU through an I
2
C interface (I
2
C0) and
two GPIO/IRQ signals (PTE27 and PTE28). See Table 5 “ Error! Reference source not found.
” for
connection details.
When using Kinetis Bootloader to update K65 MCU flash firmware with an I
2
C interface, remove the
jumpers on J35 so I
2
C communication is not affected by the accelerometer connection. For information
on Kinetis Bootloader, see freescale.com/kboot .
Default: 1-2, 3-4
(Enable Accel Interrupts)
Default: 1-2, 3-4
(Enable Accel I2C)
ACC_SA0
ACC_BYP
ACCL_INT1
ACCL_INT2
PTE19 I2C0_SCL
PTE18 I2C0_SDA
PTE27
PTE28
ACCL_SCL
ACCL_SDA
V_BRD
V_BRD
P3V3
PTE[0..28] {4,5,6,7,8}
PTE[0..28] {4,5,6,7,8}
C44
0.1uF
10%
10V
C45
0.1uF
10%
10V
J35
HDR_2X2
1 2
3 4
R59
10K
DNP
C47
0.1uF
10%
10V
J22
HDR_2X2
1 2
3 4
R62
10K
5%
C46
4.7uF
10%
10V
U15
MMA8451Q
V
D
D
IO
1
BYP
2
V
D
D
14
G
N
D
1
5
G
N
D
2
10
G
N
D
3
12
NC3
3
NC8
8
NC13
13
NC15
15
NC16
16
INT1
11
INT2
9
SCL
4
SDA
6
SA0
7
Figure 5. Accelerometer connection
3.10 Potentiometer, Pushbuttons, LEDs
The TWR-K65F180M features:

A potentiometer connected to an ADC input signal (ADC1_SE16/ADC0_SE22)

Two pushbutton switches (SW2 and SW3 connected to PTA4 and PTA10)

User controllable LEDs connected to GPIO signals
o
Yellow LED D6 connected to PTB4
o
Orange LED D7 connected to PTB5
o
LED D8 connected to PTA28
o
LED D9 connected to PTA29