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L9908 데이터시트(PDF) 130 Page - STMicroelectronics

부품명 L9908
상세설명  Automotive 3-Phase motor gate driver unit
PDF  152 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9908 데이터시트(HTML) 130 Page - STMicroelectronics

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Register name
Address
Field name
Type
Bit offset
Bit width
Reset value
Reset
NSR
CRCERR
Wrong CRC check value
CR
11
1
0x0
A
SHORTERR
Previous SPI frame length<32 bit
CR
10
1
0x0
A
LONGERR
Previous SPI frame length>32 bit
CR
9
1
0x0
A
UNUSED_8
RO
8
1
0x0
A
UNUSED_7
RO
7
1
0x0
A
UNUSED_6
RO
6
1
0x0
A
UNUSED_5
RO
5
1
0x0
A
UNUSED_4
RO
4
1
0x0
A
UNUSED_3
RO
3
1
0x0
A
UNUSED_2
RO
2
1
0x0
A
UNUSED_1
RO
1
1
0x0
A
UNUSED_0
RO
0
1
0x0
A
5.21
Window watchdog timer (WTD)
L9908 implements a watchdog timer function to ensure a safe SPI communication with μC in case of corrupted or
lost SPI communication.
Figure 85. Watchdog timer simplified block diagram
The watchdog timer function can be enabled by the SPI signal WDT_EN in the register GEN_CFG1:
Table 144. Watchdog enable bit
WDT_EN
Description
0
Watchdog disabled (Default)
1
Watchdog enabled
Activation status of WDT is also stored in the SPI read only register WD_ON_STATUS: WD_ON_STATUS = 0
WDT is not active, WD_ON_STATUS = 1 WDT is active.
As soon as the watchdog is enabled the overflow counter is started thus defining the available refresh window
Twdt_ovf which length is defined by the SPI register WDT_OVF_CFG.
L9908
Functional description
DS13546 - Rev 5
page 130/152



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