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MAX6621AUB+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
MAX6621
PECI-to-I
2
C Translator
4 _______________________________________________________________________________________
Note 1: All parameters are tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design; not production tested.
Note 3: A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
IL
of the SCL signal) to bridge
the undefined region of SCL’s falling edge.
Note 4: C
b
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3 x V
CC
and 0.7 x V
CC
.
Note 5: I
SINK
≤ 6mA. C
b
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3 x V
CC
and 0.7 x V
CC
.
Note 6: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
Note 7: The MAX6621 must drive a more restrictive time to allow for quantized sampling errors by a client yet still attain the mini-
mum time less than 500μs. t
BIT
limits apply equally to t
BIT-A
and t
BIT-M
.
Note 8: The minimum and maximum bit times are relative to t
BIT
defined in the timing negotiation pulse.
Note 9: Extended trace lengths can appear as additional nodes.
Note 10: The client may deassert its low idle drive prior to the falling edge of the first bit of the message by using the rising edge to
detect a message start. However, the time delay must be sufficient to qualify the rising edge as a true message rather than
a noise spike.
Note 11: The message stop is defined by two consecutive periods when the bus has no rising edge. Tolerance around this time is
based on the t
BIT-M
error budget.
Note 12: t
SETUP
is not additive with t
STOP
. Rather, these times may overlap.
TIMING CHARACTERISTICS (continued)
(
Typical Application Circuit
, V
CC
= +3V to +3.6V, V
REF
= +0.95V to +1.26V, T
A
= -20°C to +120°C, unless otherwise noted. Typical
values are at V
CC
= +3.3V, V
REF
= +1.0V, T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Bit Time Jitter t
BIT
,
j
itter
Between adjacent bits in an PECI message
header or data bytes after timing has been
negotiated
1%
Change in Bit Time t
BIT
,
drift
Across a PECI address or PECI message
bits as driven by MAX6621
2%
High-Level Time for Logic-High t
H1
(Note 8) 0.6 0.75 0.8 x t
BIT
High-Level Time for Logic-Low t
H0
0.2 0.3 0.4 x t
BIT
Client Asserts PECI High
During Logic-High
t
SU
0 0.2 x t
BIT-M
Rise Time t
R
Measured from V
OL
to V
P
MAX,
V
REF(nom)
-5% (Note 9)
30 +
5/Node
ns
Fall Time t
F
Measured from V
OH
to V
N
MAX,
V
REF(nom)
+5% (Note 9)
30/Node ns
Hold Time t
HOLD
Time for client to maintain a low idle drive
after MAX6621 begins a message (Note 10)
0.5 x t
BIT-1
Stop Time t
STOP
A constant low level driven by MAX6621
(Notes 8, 11)
2x t
BIT-M
Maximum Dwell Time of the
PECI Client
t
RESET
From the end of a ResetDevice command
to the next message to which the reset
client must be able to respond
0.4 ms
Minimum PECI Low Time
Preceding a Message
t
SETUP
If the prior t
BIT
is not known by MAX6621,
the maximum t
BIT
must be assumed and
t
SETUP
= 1ms in this case (Note 12)
2x t
BIT-X
MAX6621
Pin Description
PIN NAME FUNCTION
1 PECI Platform Environment Control Interface (PECI) Serial-Bus Input/Output
2 AGND Analog Ground
3 AD0 I
2
C Bus Device Address Selection Input
4 SDA I
2
C Bus Data Input/Output
5 SCL I
2
C Bus Clock Input/Output
6V
CC
Power Supply. Bypass to GND with a 0.1μF capacitor.
7 GND Power-Supply Ground
8 RESET
I
2
C Reset Input. Pull RESET low to reset I
2
C interface and default all registers to startup values.
Drive high for normal operation.
9 ALERT
ALERT Interrupt Open-Drain Output. Asserts low when any temperature exceeds the
programmed limit.
10 V
REF
PECI Input Supply Voltage. Bypass V
REF
to AGND with a 0.1μF capacitor.
PECI-to-I
2
C Translator
_______________________________________________________________________________________ 5
SDA
SCL
I
2
C
PORT
PECI
TRANSLATION
ENGINE
PECI
PORT
V
REF
PECI
ALERT
RESET
AD0
MAX6621
Block Diagram
MAX6621
PECI-to-I
2
C Translator
6 _______________________________________________________________________________________
Configuration
The MAX6621 has four configuration registers (Table 1).
CONFIG0 is the main configuration register that enables
the PECI sockets, I
2
C bus timeout, PEC, alert activation,
and polling delay. CONFIG1 sets the number of retries,
CONFIG2 sets the temperature offset, and CONFIG3
controls the temperature averaging. You can write to
the configuration registers to set the configuration or
read from the configuration registers to get the current
settings.
Detailed Description
The MAX6621 obtains temperature data from an inter-
nal temperature sensor in PECI-compliant hosts. Up to
four PECI hosts can be connected to the PECI I/O inter-
face. The MAX6621 handles all the PECI transmissions
and uses a 2-wire, I
2
C-compatible serial interface to
communicate with the PECI host.
Registers and Commands
The following is an overview of the I
2
C/SMBus regis-
ters/commands supported by the MAX6621.
ADDRESS DESCRIPTION TRANSACTION TYPE
00h Read socket 0, domain 0 temperature register ReadWord
01h Read socket 0, domain 1 temperature register ReadWord
02h Read socket 1, domain 0 temperature register ReadWord
03h Read socket 1, domain 1 temperature register ReadWord
04h Read socket 2, domain 0 temperature register ReadWord
05h Read socket 2, domain 1 temperature register ReadWord
06h Read socket 3, domain 0 temperature register ReadWord
07h Read socket 3, domain 1 temperature register ReadWord
08h Read maximum temperature for all enabled sockets/domains register ReadWord
09h Read firmware version register ReadWord
0Ah Read maximum temperature address ReadWord
0Bh Read socket and domain that caused alert ReadWord
0Ch Read/write CONFIG0 register ReadWord/WriteWord
0Dh Read/write CONFIG1 register ReadWord/WriteWord
0Eh Read/write CONFIG2 register ReadWord/WriteWord
0Fh Read/write CONFIG3 register ReadWord/WriteWord
10h Read/write alert temperature for socket 0 ReadWord/WriteWord
11h Read/write alert temperature for socket 1 ReadWord/WriteWord
12h Read/write alert temperature for socket 2 ReadWord/WriteWord
13h Read/write alert temperature for socket 3 ReadWord/WriteWord
14h Request polling SendByte
15h Clear alert SendByte
COMMAND BYTE REGISTER DESCRIPTION TYPE RESULT
0Ch CONFIG0 register ReadWord/WriteWord See the CONFIG0 section.
0Dh CONFIG1 register ReadWord/WriteWord See the CONFIG1 section.
0Eh CONFIG2 register ReadWord/WriteWord See the CONFIG2 section.
0Fh CONFIG3 register ReadWord/WriteWord See the CONFIG3 section.
Table 1. Configuration Registers
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX6621AUB+

Mfr. #:
Buy MAX6621AUB+
Manufacturer:
Maxim Integrated
Description:
Translation - Voltage Levels MAX6621 PROTOCOL CONVERTER USOP PB
Lifecycle:
New from this manufacturer.
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