LM96194CISQ/NOPB National Semiconductor, LM96194CISQ/NOPB Datasheet - Page 19

• Manufacturer Part Number: LM96194CISQ/NOPB
• Description: IC TRUTHERM HDWR MONITOR 48-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®, TruTherm®r

Specifications of LM96194CISQ/NOPB

• Function: Fan Control, Temp Monitor
• Topology: ADC (Sigma Delta), Comparator, Fan Control, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 85°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM96194CISQTR

Block Write Command
Block Read Command
Fixed Block 0
Fixed Block 1
Fixed Block 2
Fixed Block 3
Fixed Block 4
Fixed Block 5
Fixed Block 6
Fixed Block 7
Fixed Block 8
Fixed Block 9
Fixed Block 10
Fixed Block 11
outs. Pulling the Reset pin low does not reset the SMBus state
machine. If the LM96194 SMBDAT pin is low during a system
reset, the LM96194’s state machine timeouts and resets au-
tomatically. If the LM96194’s SMBDAT pin is high during a
system reset, the first assertion of a start by the master resets
the LM96194’s interface state machine.
Although it is a violation of the SMBus specification, in some
cases a START or STOP signal occurs in the middle of a byte
transfer instead of coming after an acknowledge bit. If this
occurs, only a partial byte was transferred. If a byte was being
written, it is aborted and the partial byte is not committed. If a
byte was being read from a read-to-clear register, the register
is not cleared.
14.5 SERIAL INTERFACE PROTOCOLS
The LM96194 contains volatile registers, the registers occupy
address locations from 00h to EFh.
Data can be read and written as a single byte, a word, or as
a block of several bytes. The LM96194 supports the following
SMBus/I
— Send Byte
— Write Byte
— Write Word
— SMBus Write Block
— I
— Read Byte
— Read Word
— SMBus Read Block
14.5.2 Block Command Code Summary
Block command codes control the block read and write operations of the LM96194 as summarized in the following table:
Command Code Name
2
C Block Write
2
C transactions/protocols:
Value
FAh
FBh
FCh
FDh
F0h
F1h
F2h
F3h
F4h
F5h
F6h
F7h
F8h
F9h
SMBus Block Write Command Code
SMBus Block Write/Read Process Call
Fixed Block Read Command Code: address 40h, size 8 bytes
Fixed Block Read Command Code: address 48h, size 8 bytes
Fixed Block Read Command Code: address 50h, size 6 bytes
Fixed Block Read Command Code: address 56h, size 16 bytes
Fixed Block Read Command Code: address 67h, size 4 bytes
Fixed Block Read Command Code: address 6Eh, size 8 bytes
Fixed Block Read Command Code: address 78h, size 12 bytes
Fixed Block Read Command Code: address 90h, size 32 bytes
Fixed Block Read Command Code: address B4h, size 8 bytes
Fixed Block Read Command Code: address C8h, size 8 bytes
Fixed Block Read Command Code: address D00h, size 16 bytes
Fixed Block Read Command Code: address E5h, size 9 bytes
19
— SMBus Block-Write Block-Read Process Call
— I
In addition to these transactions the LM96194 supports a few
extra items and also has some behavior that must be defined
beyond the SMBus 2.0 specification. No other SMBus 2.0
transactions are supported (PEC, ARA etc.).
The SMBus specification defines several protocols for differ-
ent types of read and write operations. The ones used in the
LM96194 are discussed below. The following abbreviations
are used in the diagrams:
S
P
R
W
A
/A
14.5.1 Address Incrementing
The established base address does not increment. Repeat-
edly reading without re-establishing a new base address
returns data from the same address each time. I
transactions can use this information and skip reestablishing
the base address, when only one master is used. One ex-
ception to this rule exists when a block write and block read
is used to emulate a block write/read process call. This is de-
tailed later, see the Block Write/Read Process Call descrip-
tion.
2
C Block Read
— START
— STOP
— READ
— WRITE
— ACKNOWLEDGE
— NO ACKNOWLEDGE
Description
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2
C read