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L9960 データシート(PDF) 21 Page - STMicroelectronics

部品番号 L9960
部品情報  Automotive Single/Dual H-Bridge, SPI programmable DC Brushed Motor Driver
PDF  95 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9960 データシート(HTML) 21 Page - STMicroelectronics

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DS11115 Rev 10
21/95
L9960, L9960T
Functional description
94
Note:
(-) available in position D0 of the SPI command frame 4.
Note:
(-) available in position R0 of the SPI answer frame 7b.
Note:
(-) available in position R5 of the SPI answer frame 8c.
If this UV protection option is not enabled, an indefinite number of consecutive battery
under-voltage events can occur with the only action taken by the device to disable the
bridge, when the battery level is below “vps_uv threshold”.
Figure 7 and Figure 8 show the cases of VPS UV events greater or smaller than 2 in the
time frame defined by UV_WIN.
Case 1 (no enabled protection)
The first VPS transition under the VPs_uv_off threshold is disregarded, due to the event
duration less than Tvps_uv.
After the second UV transition on Vps, the bridge is put in tri-state. As the protection has not
been enabled via UV_PROT bit, the H-bridge keeps on switching between On-state and tri-state.
Figure 7. Battery voltage monitoring – case1
Table 14. UV_WIN
Bit status
Description
Condition
0
UV_WIN window is set to 20 µs
Reset value
1
UV_WIN window is set to 40 µs
-
Table 15. UV_WIN_echo
Bit status
Description
Condition
0
Echo: UV_WIN window is set to 20 µs
Reset value
1
Echo: UV_WIN window is set to 40 µs
-
Table 16. UV_CNT_REACHED
Bit status
Description
Condition
0
No VS under voltage events closer than UV_WIN
Default Value
1
Two VS under voltage events closer than UV_WIN
-
GAPGPS02313
Tvps _uv
T < Tvps _uv
Vps _uv _off
Vps
‘’VPS _UV’’
ON-STATE
ON-STATE
TRI-STATE
TRI-STATE
BRIDGE
STATE
Vps _uv _hys
Tvps _uv
Tvps _uv
Tvps _uv
T > UV_WIN or UV_PROT not
enabled
ON-STATE
‘’UV _CNT_REACHED’’



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