MAX6638ATC 데이터 시트보기 (PDF) - Maxim Integrated
부품명
상세내역
제조사
MAX6638ATC Datasheet PDF : 19 Pages
| |||
Temperature Monitor with
Dual Serial Interface
A
B
C
D
EF
G
tLOW tHIGH
SMBCLK
SMBDATA
tSU:STA tHD:STA
tSU:DAT
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
Figure 5. SMBus Write Timing Diagram
H
IJK
LM
tSU:STO tBUF
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
A
B
C
D
EF
G
tLOW tHIGH
SMBCLK
H
I JK
LM
SMBDATA
tSU:STA tHD:STA
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
tSU:DAT
tHD:DAT
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS DATA LINE LOW
Figure 6. SMBus Read Timing Diagram
tSU:STO tBUF
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
GND, or DXN. If an open or short exists, each of the
external temperature registers contains 1111 1111.
When an open-circuit fault occurs, bit 2 (OPEN) in the
status byte sets to 1. If a fault is present upon power-
up, the fault is not indicated until the end of the first
conversion cycle.
ALERT_ Interrupts
The ALERT_ interrupt occurs when the internal or exter-
nal temperature reading exceeds a high- or low-tem-
perature limit (programmed). The ALERT_ output signal
latches and can only clear by either reading the status
register or by successfully responding to an alert-
response address. In both cases, the alert clears if the
temperature fault condition no longer exists. Asserting
ALERT_ does not halt automatic conversion. The open-
drain ALERT_ outputs allow multiple devices to share a
common interrupt line.
The MAX6638 responds to the SMBus alert-response
address, an interrupt pointer return-address feature.
Prior to taking corrective action, always check to ensure
that an interrupt is valid by reading the current temperature.
Alert Fault-Queue Register
In some systems, it is desirable to ignore a single tem-
perature measurement that falls outside the ALERT_
limits. Bits 1 and 2 of the fault queue register (address
22h) determine the number of consecutive temperature
faults necessary to set ALERT_.
Alert-Response Address
The SMBus alert-response interrupt pointer provides
quick fault identification for simple slave devices that
10 ______________________________________________________________________________________
Share Link: 