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L9803 bảng dữ liệu(PDF) 68 Page - STMicroelectronics

tên linh kiện L9803
Giải thích chi tiết về linh kiện  Super smart power motor driver with 8-Bit MCU, RAM, EEPROM, ADC, WDG, Timers, PWM and H-bridge driver
PDF  126 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L9803 bảng dữ liệu(HTML) 68 Page - STMicroelectronics

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On-Chip Peripherals
L9803
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Figure 33.
Impedance at PWMO/I pin
5.4.3
PWMI
PWMI is an input line, directly connected to PB2 bit. The circuit translates the voltage levels
referred to VB voltage supply to the internal logic levels (see Figure 32). When the voltage
on PWMI pin is higher than VB/2 PB2 reads an high logic level.
If the bit PWMI in DCSR register is set (see Section 3.2.1), PWMI is directly connected with
the Input Capture 2 on Timer 2, which is otherwise connected in alternate function to PA7
(see Figure 34).
An internal pull down current generator (5µA) allows to detect the Open Bus condition
(external pull up missing).
If the battery or ground connection are lost, the PWMI line shows a controlled impedance
characteristic (see Figure 34).
Figure 34.
PWMI function
Describe the register DCSR (0022h) as reported in Table 1.
50K
Ω
50K
Ω
5
µA
VK
IK
14V
0
1
TIMER 2
ICAP2
PIEN
DCSR
PWM
I/O
M
U
X
PWM INPUT
PA(7) ALTERNATE INPUT
PORT
PWMI
PA7
PA(7)
PB(2)



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