fma1127da Fujitsu Microelectronics, Inc., fma1127da Datasheet - Page 14

• 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
• 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=10KΩ, C1=1uF)
• For LED control through DIO ports, sink current circuit is mandatory as shown above.
•
12
resistor is typically used.
I
tional START condition which causes the TSC to wait indefinitely.
Recommendations to avoid such a noise glitch:
1. Addition of serial resister on
2. Addition of about capacitor on
2
C
mechanism. The size of capacitor depends on existing parasitic capacitance of the board (~Value ranging from 30pf to 300pf).
Fujitsu Microelectronics America, Inc.
has no recovery specification when clk is attacked by noise glitch or ESD. Sometimes ‘additional’ clock by noise glitch generates uninten-
RESET_N(From MCU)
Touch PAD
Touch_Sensor_4
Touch_Sensor_3
Touch_Sensor_2
Touch_Sensor_1
Touch_Sensor_0
Touch_Sensor_7
Touch_Sensor_6
Touch_Sensor_5
Touch_Sensor_8
(LED Control Circuit)
10K
DIO_N
I
2
I
R1
C
1uF
2
I
C
2
clock line and data line having values ranging from 100ohm to 500ohm.
C
communication. For 5V application, 2K ohm resistor is typically used. For 3V application, 1K ohm
clock line and data line and connect other end to ground. This would add some filtering
VDD
Touch PAD
C1
Touch_Sensor_2
Touch_Sensor_3
Touch_Sensor_1
Touch_Sensor_0
Data Sensor
Tuning Cap
28
32
26
27
30
31
25
29
DIO_3
DIO 2
S2
S1
S0
RESET_N
ID
S3
1
FMA1127DA
24
2
23
2K
2K
3
32N
22
4
21
5
20
6
19
7
18
CONFIG_0
CONFIG_1
8
17
DIO_6
DIO_7
DIO_8
DIO_9
AREF
S8
16
15
14
13
12
11
10
9
Reference Sensor
Tuning Cap
Touch_Sensor_8