參數(shù)資料
型號(hào)： L9942
廠商： 意法半導(dǎo)體
英文描述： Super Smart Motor Bridge Driver(電機(jī)橋驅(qū)動(dòng)器)
中文描述： 超級(jí)智能電機(jī)橋式驅(qū)動(dòng)器（電機(jī)橋驅(qū)動(dòng)器）
文件頁(yè)數(shù)： 5/21頁(yè)
文件大?。?/td> 160K
代理商： L9942
IN2,IN1,EN2, EN1:
These bits control the status of the M1 and M2 power outputs, according to the fol-
lowing table:
Control Bits
Output Status
M1
Z
SINK
SOURCE
M2
Z
SINK
SOURCE
EN1
0
1
1
EN2
0
1
1
IN1
X
0
1
IN2
X
0
1
NOTE:
Z
SOURCE = HSD ON, LSD OFF
SINK
= HSD OFF,LSD ON
= HSD OFF, LSD OFF
EN1 and EN2 are automatically cleared at overcurrent condition (SC of BSR is high) switching off the
bridge. To switch the bridge on againthese bits have to be set by software.
PAES:
This bit is used to select the edge sensitivity for the interrupts coming from PORTA. When SET,
the interrupts occur on rising edge, when RESET they occuron falling edge.
BUSIE:
This bit is used to multiplex CAN input/output lines to PORTA0,1 pins (see Fig. 6). When set
PA0,1 operate as CAN I/O, when reset they can be used as normal I/O pins.
PIE:
This bit, when SET and bit4 of the
IOR
register is also SET, enables the interruptscoming from the
power section, i.e. from
UNV
,
OVT1
,
OVT2
,
SC and OV
bits. When RESET, these interrupts are dis-
abled.
BSR
BRIDGE Status Register
(Address: E3h, Read/write)
Status after reset: 00000000
D0
D1
D2
D3
D4
D5
D6
D7
-
-
-
Not used, readas zero
Not used, readas zero
Not used, readas zero
Short circuit flag
Overvoltage flag
Undervoltage flag.
Overtemperature flag. 1
Overtemperature flag. 1
SC
OV
UNV
OVT1
OVT2
SC:
This bit is set as soon as one of the two outputs (or both) are shorted to battery, ground or if the two
outputs are shorted together(load shorted). This bit is RESET by software only. The rising edge causes
on interrupt request on the interrupt line #0. Short circuit protection is realized with one sensing resistor
for each half bridge. The voltage drop at these resistors is monitored in order to switch off the complete
bridge if the current exceeds ISHC. When bit SC is set, the bridge enable bits EN1 and EN2 of
bridge/port control register BPCR are cleared and the bridge is switched off. This clear function is domi-
nant over any write from data bus by software (i. e. as long as SC is set, the bridge cannot be switched
on). The bridgecan be switched on again only after clearing bit SC. For this purpose enable bits EN1 or
EN2 of registerBPCR have to be set again.
OV:
This bit is set if the battery voltage raises above V
smax
. This bit is RESET by softwareonly. The ris-
POWERSUPPLY
(continued)
L9942
5/21
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