fma1127da Fujitsu Microelectronics, Inc., fma1127da Datasheet - Page 12

• Manufacturer Part Number: fma1127da
• Description: Touch Sensor Controller
• Manufacturer: Fujitsu Microelectronics, Inc.

Touch Sensor Controller
Typical Application Circuit
Notes:
• The voltage range of VDD can be from 2.3V to 5.5V. If internal LDO is used, it should be from 3V to 5.5V.
• Pull-Up resistors are required for I2C communication. For 5V application, 2K ohm resistor is typically used. For 3V application, 1K
• Each tuning capacitor is an optional component depending on PCB layout environment.
• The circuit above is a typical application circuit using an internal LDO.
• RESET_N pin should be connected to host MCU GPIO and needs an RC filter. (R1=10K Ω , C1=1uF)
• For LED control through DIO ports, sink current circuit is mandatory as shown above.
• I
10
ohm resistor is typically used.
unintentional START condition which causes the TSC to wait indefinitely.
Recommendations to avoid such a noise glitch:
1. Addition of serial resister on I
2. Addition of about capacitor on I
2
C has no recovery specification when clk is attacked by noise glitch or ESD. Sometimes ‘additional’ clock by noise glitch generates
of capacitor depends on existing parasitic capacitance of the board (~Value ranging from 30pf to 300pf).
Fujitsu Microelectronics America, Inc.
MCU
MCU
MCU
2K
R2
(LED Control Circuit)
2 K
DIO_N
R3
2
RESET_N (From MCU)
C clock line and data line having values ranging from 100ohm to 500ohm.
2
C clock line and data line and connect other end to ground. This would add some filtering mechanism. The size
10
1
2
3
4
5
6
7
8
9
VDD
TINT
DIO_1
SCL
BEEP
DIO_10
DIO_0
SDA
GINT
TCLK
DIO_11
FMA1127DA
R1
1 uF
10 K
40N
C1
VLDO
VPH
VGG
V25
S6
S7
S3
S4
S5
S8
30
29
28
27
26
25
24
23
22
21
VDD
Touch PAD 10
Touch PAD 11
Touch PAD 0
Touch PAD 4
Touch PAD 5
Touch PAD 6
Touch PAD 7
Touch PAD 8
Touch PAD 9
Touch PAD 1
Touch PAD 2
Touch PAD 3
Data Sensor
Tuning Cap
Touch PAD 0~11