HL55104
GENERAL DESCRIPTION
HL55104 is an object proximity sensor IC, with four capacitive input keys and four direct outputs. The state of an output is correspondence to the state of an input key directly. There are three kinds of output modes (active high, active low and active low with open drain), which can be chosen by polarity pin. HL55104 is fabricated by CMOS process with very low power consumption. There are two operating mode, low power current mode and normal mode. In low power mode, the operating current is about 10uA for four keys operation. In normal operating mode, the response time is very fast. When there is a key detected, HL55104 will enter into normal state with fast response time. In the normal state, HL55104 will enter into low power state if there is not key detected for about 22sec.
In order to be used in a variety of different applications, there are some parameters used to define the sensitivity, time waiting for a stable state and polarity of the output.
FEATURES
- Mixed mode integrated circuit
- Direct output driver
- Dual operating modes: low power mode and normal mode
- Output polarity can be selected by an input pin
- Parameters can be programmed by external pins
- Built-in regulator circuit, excellent voltage stability
- Built-in Oscillator circu
- Built-in Power on reset circuit
- Performance invariance from the variation of temperature
- Key wake up from low power state
ABSOLUTE MAXIMUM RATING
Supply Voltage (VDD to GND) ------------------------- 5.5V
Input Voltage Range ------------------------------ (GND - 0.3V) to (VDD + 0.3V)
Operating Temperature Range ----------------------- -40℃ to +80℃
ELECTRICAL CHARACTERISTICS
(VDD=3V, GND=0V, Ta=+25℃)
PARAMETER |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
| VDD | Supply Voltage | 2.4 | 3.0 | 5.5 | V |
| Standby Current | ENBIN = VDD | uA | |||
| Operating Current | Normal State | 38 | uA | ||
| Low Power State | 10 | uA | |||
| Input low voltage | 0.9 | V | |||
| Input high voltage | 2.1 | V | |||
| Output low voltage | I out = 10mA | 0.2 | V | ||
| Output high voltage | I out = 3mA | 2.6 | V |
OPERATION OF THE SYSTEM
The parameters PIN include MODE, SENSA, SENSA, REFT and ENBIN. There are 3 states input pin. The pin can be set as 0, 1 or Floating.
The HL55104 is active or not is set by ENBIN pin.
HL55104 is active when set ENBIN 0 or Floating. HL55104 is disable if set ENBIN 1.
REFT determine the time period for key waiting for a stable state.
REFT |
0 |
Floating |
1 |
KEY ON |
0.7sec |
1.4sec |
2.8sec |
KEY OFF |
2sec |
4sec |
8sec |
(F= Floating)
PS: The pin of REFT is floating in HL55104ASP6.
The sensitivity of a valid key is set by SENSB and SENSA. There are three different levels of sensitivity. SENSB=F and SENSA=0 is the most sensitive level, and SENSB=1 and SENSA=1 is the least sensitive level.
SENSB |
SENSA |
|
F |
0 |
most sensitive level |
F |
F |
|
F |
1 |
|
0 |
0 |
|
0 |
F |
|
0 |
1 |
|
1 |
0 |
|
1 |
F |
|
1 |
1 |
least sensitive level |
(F= Floating)
PS: The pin of SENSA is floating in HL55104ASP6.
MODE is polarity pin. It defines the polarity of the OUT pins.
HL55104 is direct outputs.
If MODE=0, the OUT pins are low active output.
If MODE=Floating, the OUT pins are low active with open drain output.
If MODE=1, the OUT pins are high active output.
APPLICATION CIRCUIT
