User's Manual

1323x Remote Control Motherboard
1323x Development Hardware Reference Manual, Rev. 1.0
4-12 Freescale Semiconductor
Figure 4-7 shows the touchpad circuit.
Figure 4-7. 1323x-RCM Touchpad Circuit
4.2.3.5 3-Axis Accelerometer
The 1323x-RCM contains a Freescale MMA7660 3-axis accelerometer with IIC interface.
• Uses a 3mm x 3mm x 0.9mm DFN package
• Device interface supports IIC bus and system reset
• Supports an auto-wake/sleep feature for Low power consumption.
• When the device is in auto-sleep state, if a shake interrupt, tap interrupt, Delta G, or orientation
detection interrupt occurs, the device comes out of sleep mode and generates an interrupt request
via the IRQ signal
Figure 4-8 shows the accelerometer circuit.
Figure 4-8. 1323x-RCM Accelerometer Circuit
4.2.3.6 Buzzer
The 1323x-RCM provides a single tone audio buzzer.
• Device LS1, CUI Inc., Part No. CMI-1240
• 4.0 kHz resonant frequency
• Device is buffered by Q2 and active when MCU output PTA1 is high (see Table 4-3)
Figure 4-9 shows the buzzer circuit.
R52
10K
VDD
1
SDA
2
SCL
3
GND
4
IRQ
5
RESET
6
KBI 0
7
KBI 1
8
NC1
9
NC2
10
NC3
11
NC4
12
NC5
13
NC6
14
J11
TOUCHPAD
I2C_SDA
V_TPD
R34
10K
I2C_SCL
R33
10K
KBI1P6
TPKBI 1
TPKBI 0
RSTb
V_TPD
1
4
2
3
KB0
PB switch
TPKBI0 TPKBI1
1
4
2
3
KB1
PB switch
TPKBI 1TPKBI0
RESERVED
1
NC1
2
AVDD
3
AVSS
4
INT
5
NC2
10
DVDD
9
DVSS
8
SDA
7
SC L
6
U5
MMA7660FC
C28
10UF
C26
10UF
C29
0.1UF
C27
0.1UF
I2C_SDA
I2C_SCLIRQb
V_ACC
V_ACC