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参数资料
| 型号： | L9904 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 6/17页 |
| 文件大小： | 279K |
| 代理商： | L9904 |
L9904
14/17
tCCP= RPR CPR ln NPR
with NPR= VPRH / VPRL = 2
tCCP= 0.69 RPR CPR
3.14 ISO-Interface
The ISO-Interface provides the communication between the micro controller and a serial bus with a baud rate
up to 60kbit/s via a single wire which is VBAT and GND compatible. The logic level transmission input TX drives
the open drain K-output. The K output can be connected to a serial bus with a pull up resistor to VBAT. The K-
pin is protected against overvoltage, short to GND and VS and can be driven beyond VVS and GND. During lack
of VVS or GND the output shows high impedance characteristic. The open drain output RX with an internal pull
up resistor monitors the status at the K-pin to read the received data and control the transmitted data. Short
circuit condition at K-pin is recognized if the internal open drain transistor isn't able to pull the voltage potential
at K-pin below the threshold of 0.45VVS. Then the RX stays in high condition. A timer starts and switches the
open drain transistor after typ. 20s off. A next low at the TX input resets the timer and the open drain transistor
switches on again.
Figure 11. Functional schematic of the ISO-interface
RX
TX
K
VCC
R RX
0.5
VVS
TX
R
TSH
delay
=
R
S
Q
R
IKH
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