TTP224N-BSB is a widely used 4-channel capacitive touch chip with up to 4 touch input ports and 4 direct output ports. SSOP16 small package with fast mode and low Power mode 2 kinds of operation modes, which can be selected by the pin to select the output level to be high effective or low effective. It is widely used in toys, consumer electronics and other
Features
- Built-in voltage regulator circuit provides stable voltage for touch detection circuit.
- The fastest response time of KEY is 100ms in fast working mode and 200ms in low power working mode.
- Each KEY sensitivity can be adjusted separately by an external capacitor (1~50pF).
- Provide LPMB port selection fast working mode or low power working mode.
- Provides direct output mode, latched output mode, open-drain output, CMOS active-high or active-low output, selected via TOG/OD/AHLB port.
- The reference value is refreshed every 1 second in the first 8 seconds of the IC power-on. If the Key is touched or after 8 seconds, it is re-sampled every 4 seconds.
Applications
that can replace traditional mechanical buttons or tact switches.Pin Description
| Pin No. | Pin Name | Description | Pin No. | Pin Name | Description |
| 1 | TP0 | Touchpad 1 Input Pin | 9 | MOT0 | Key maximum on-time option - 1 |
| 2 | TP1 | Touchpad 2 Input Pin | 10 | VSS | Negative Supply or GND |
| 3 | TP2 | Touchpad 3 Input Pin | 11 | OD | Output open-drain selection pin |
| 4 | TP3 | Touchpad 4 Input Pin | 12 | SM | Single or multi-key selection pin |
| 5 | AHLB | Output Selection Pin | 13 | TPQ3 | Direct output of Key Touchpad 4 |
| 6 | VDD | Positive Supply | 16 | TPQ2 | Direct output of Key Touchpad 3 |
| 7 | TOG | Output Type Selection Pin | 17 | TPQ1 | Direct output of Key Touchpad 2 |
| 8 | LPMB | Low Power/Fast Mode Selection | 18 | TPQ0 | Direct output of Key Touchpad 1 |
Features
- Built-in voltage regulator circuit provides stable voltage for touch detection circuit.
- The fastest response time of KEY is 100ms in fast working mode and 200ms in low power working mode.
- Each KEY sensitivity can be adjusted separately by an external capacitor (1~50pF).
- Provide LPMB port selection fast working mode or low power working mode.
- Provides direct output mode, latched output mode, open-drain output, CMOS active-high or active-low output, selected via TOG/OD/AHLB port.
- The reference value is refreshed every 1 second in the first 8 seconds of the IC power-on. If the Key is touched or after 8 seconds, it is re-sampled every 4 seconds.
Specification
| IC Name | TTP224B-BSB |
| Type | Four-channel touch key sensing |
| Operating Voltage | 2.5V - 5.5V DC |
| Operating current | 2.5uA in low power mode |
| Maximum Operating Current | 9.0uA in Fast mode |
| Response Time | 100ms at fast mode and 200ms at low power mode |
| Sensitivity | Adjustable using an external capacitor (0-50 pF) |
| IC Package | SSOP16 |
FAQs
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