Курсовая работа: Система управления установкой для измерения влажности и давления
Внешний вид датчика представлен на
рисунке 2.7
Его параметры
представлены в таблице 2.7
Таблица 2.7
| Параметр |
Обозначение |
Условия |
Min. |
Typ. |
Max. |
Unit |
| Input High Level |
VIH
|
|
4.5 |
– |
1 |
Vs |
| Input Low Level |
VIL
|
|
0 |
– |
0.5 |
Vs |
| Output Low Level |
VOL
|
Open Drain IOL = -4 mA
|
|
– |
0.1 |
Vs |
| Pull up Current |
VOH
|
Pin SCL and SDA |
5 |
– |
20 |
μA |
| Load Capacitance SDA |
CL_SDA
|
|
- |
– |
400 |
pF |
| SCL clock frequency |
fSCL
|
|
- |
– |
100 |
kHz |
| Bus free time between STOP and START
condition |
tBUF
|
|
4.7 |
– |
– |
μs |
| Hold time (repeated) START condition |
tHD,STA
|
To first clock pulse |
4.0 |
– |
– |
μs |
| LOW period of SCL |
tLOW
|
|
4.7 |
– |
– |
μs |
| High period of SCL |
tHIGH
|
|
4.0 |
– |
– |
μs |
| Setup time repeated START condition |
tSU, STA
|
|
4.7 |
– |
– |
μs |
| Data hold time |
tHD, DAT
|
|
0 |
– |
– |
ns |
| Data setup time |
tSU, DAT
|
|
250 |
– |
– |
ns |
| Rise time of both SDA and SCL |
tR
|
|
– |
– |
300 |
ns |
| Fall time of both SDA and SCL |
|
|
– |
– |
300 |
ns |
| Setup time for STOP condition |
tSU, STO
|
|
4 |
– |
– |
μs |
| Input filter spike suppression |
tsp
|
Spikes on SDA or SCL of that length are
suppressed |
– |
– |
50 |
μs |
|
|
|
|
|
|
|
|
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