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L9945 데이터시트(PDF) 112 Page - STMicroelectronics

부품명 L9945
상세설명  Automotive fully configurable 8-channel High/Low side MOSFET pre-driver suitable for 12 V and 24 V systems
PDF  144 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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Figure 25. BIST & HWSC sequence
GADG2011171331PS
POR
•HWSC_DONE = 0
•HWSC_DIS = 1
•BIST_DONE = 0
•BIST_DIS = 1
BIST
•HWSC_DONE = 0
•HWSC_DIS = 1
•BIST_DONE = 0
•BIST_DIS = 1
HWSC
•HWSC_DONE = 0
•HWSC_DIS = 1
•BIST_DONE = 1
•BIST_DIS = X
END
•HWSC_DONE = 1
•HWSC_DIS = X
•BIST_DONE = 1
•BIST_DIS = X
BIST_RQ = 01
N_POR 1  0
NRES 1  0
Table 32. HWSC timing characteristics
Symbol
Parameter
Min.
Max.
Unit
tHWSC_DUR
HWSC duration time
100
160
µs
6.1.4
VPS undervoltage
In case VPS is lower than VVPS_UV for tVPS_react + tLBD_FIL, a battery undervoltage is detected, all outputs are
actively turned off and the VPS_LATCH is set high (cleared on SPI readout). The undervoltage comparator output
can be monitored by reading VPS_STATE bit via SPI. Outputs are re-engaged when undervoltage condition
disappears.
Table 33. VPS UV detection electrical characteristics
Symbol
Parameter
Min.
Max.
Unit
VVPS_UV
VPS low battery detection threshold
3.5
3.8
V
tVPS_react
VPS Comparator output reaction time for L->H and H->L transition
100
700
ns
tLBD_FIL
Filter time for VPS low battery detection
0.5
5
µs
6.1.5
Charge pump undervoltage
In case VGBHI is lower than VCP_UV for tCP_UV, a charge pump undervoltage is detected, all outputs are actively
turned off and the VCP_UV_LATCH is set high (cleared on SPI readout). The undervoltage comparator output
can be monitored by reading VCP_UV_STATE bit via SPI. Outputs are re-engaged when undervoltage condition
disappears.
Table 34. Charge pump undervoltage detection electrical characteristics
Symbol
Parameter
Test condition
Min.
Max.
Unit
VCP_UV
Under voltage threshold
Referenced to VVPS
VVPS + 3.9
VVPS + 5.1
V
L9945
Safety & diagnostics
DS12275 - Rev 10
page 112/144



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