3.2 Sleep Period
The MTCH9010 liquid detector has a configurable Sleep period, which can be done either through the analog input pin SLP_PER or the Enhanced Configuration using UART. There are nine predefined Sleep periods, ranging from 1 to 256 seconds. Additionally, the MTCH9010 provides on-demand wake-up via the WU pin. The WU pin detects falling edge signals, interrupts the Sleep state, checks for liquid presence, and returns the device to the Sleep state until the following wake-up request.
Note: Between wake-up requests, implement a wait time of at least
150 ms.
The SLP_PER pin must be in the range of 0V and VDD. The following table shows the corresponding voltage for the wake-up request and each of the predefined Sleep periods:
Voltage Value for Sleep Period Setting | Sleep Period [s] | Option | ||
---|---|---|---|---|
Interval Lower Limit [V] | Interval Upper Limit [V] | Ideal Value [V] | ||
GND | 1 × VDD / 18 | GND | - | Wake-up on Request |
1 × VDD / 18 | 3 × VDD / 18 | 1 × VDD / 9 | 1 | Sleep period of 1 second |
3 × VDD / 18 | 5 × VDD / 18 | 2 × VDD / 9 | 2 | Sleep period of 2 seconds |
5 × VDD / 18 | 7 × VDD / 18 | 3 × VDD / 9 | 4 | Sleep period of 4 seconds |
7 × VDD / 18 | 9 × VDD / 18 | 4 × VDD / 9 | 8 | Sleep period of 8 seconds |
9 × VDD / 18 | 11 × VDD / 18 | 5 × VDD / 9 | 16 | Sleep period of 16 seconds |
11 × VDD / 18 | 13 × VDD / 18 | 6 × VDD / 9 | 32 | Sleep period of 32 seconds |
13 × VDD / 18 | 15 × VDD / 18 | 7 × VDD / 9 | 64 | Sleep period of 64 seconds |
15 × VDD / 18 | 17 × VDD / 18 | 8 × VDD / 9 | 128 | Sleep period of 128 seconds |
17 × VDD / 18 | VDD | VDD | 256 | Sleep period of 256 seconds |