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STLC5444FN Datasheet(PDF) 10 Page - STMicroelectronics

Part # STLC5444FN
Description  QUAD FEEDER POWER SUPPLY
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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The LER is used to enable or disable the individ-
ual line drivers. The line drivers will only become
active if the corresponding bit in the TOR is inac-
tive. The LER is a read/write register.
The MPI is the interface containing the following
pins :
D3-D0
Bidirectional
Data Bus
A0
Input
Address Line
ALE
Input
Address Latch Enable
RD
Input
Read Enable
WR
Input
Write Enable
CS
Input
Chip Select
INT
Output
COD Interrupt
RESET
Input
Reset pin
The 4-bit bidirectional data bus (D3-D0) is used to
communicate with the registers. Access to the
registers is controlled by CS, RD, WR, ALE, and
A0 as shown below. A read or write cycle must be
preceded by a valid A0. A0 is latched internally in
a transparent latch by ALE. The selection of the
status group or the LER is determined by the con-
tent of the IAR.
The truth table for the MPI control is shown below
:
CS
RD
WR
A0
0
1
0
0
Write IAR (T bit is read only)
0
0
1
0
Read IAR and T bit
0
1
0
1
Write LER
0
0
1
1
Read status groups or LER
1
X
X
X
No access
Indirect Address Register (IAR) and T/I Bit
The IAR is 3 bits wide and accessible through the
data port, D2-D0. The content of the Indirect Ad-
dress Register (IAR2-IARO) determines the se-
lection of the status groups or the LER. The ther-
mal overload bit T/I is read and written at the
same time as IAR and occupies D3.
This register has the following format :
Bit
Symbol
0
1
2
3
IARO
IAR1
IAR2
T/I
Bit 0 of the IAR
Bit 1 of the IAR
Bit 2 of the IAR
T bit: (Read only)
Logical 0: temperature normal (default value)
Logical 1: temperature above 160
°C (all drivers shut off)
I bit
: (write only)
Logical 0: INT pin disabled
Logical 1: COD interrupts enabled via INT pin‘
IAR2-IAR0 address the status groups and the LER as shown below:
IAR2
IAR1
IAR0
Select
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
LVD
OLD
COD
LEC
RESERVED
RESERVED
LER
TOR
STLC5444
10/17


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