MAX6618AUB+TG11 Maxim Integrated Products, MAX6618AUB+TG11 Datasheet - Page 9

• Manufacturer Part Number: MAX6618AUB+TG11
• Description: IC TRANSLATOR PECI-I2C 10-MSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6618AUB+TG11

• Logic Function: Translator
• Number Of Bits: 1
• Input Type: PECL
• Output Type: I²C™
• Number Of Channels: 1
• Number Of Outputs/channel: 1
• Differential - Input:output: No/No
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -20°C ~ 120°C
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Supply Voltage: 3 V ~ 3.6 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Rate: -

This optional feature can be enabled using bit 6 of
CONFIG0. When the alternate data format is enabled, the
temperature value is shifted right as shown in Table 9. The
most significant bits are set to all 0s or all 1s depending on
the sign bit 15, also shown as S in Figure 3. Table 10
shows some example values. This translation is not per-
formed for error codes (16-bit values from 8000h
through 81FFh).
Excluding error codes, the software only has to exam-
ine the RESLO data byte, as it represents an integer
value in the range from -128°C to +127°C in 1°C steps.
The RESHI byte is all 0s or all 1s for valid return codes,
and either 80h or 81h for all error codes.
Table 9. Alternate Temperature
Representation
Table 10. Example of Alternate Representation with No Offset (Activation Point = +95°C)
16-bit value
Alternate
representation
DESCRIPTION
TEMP (°C)
Alternate Temperature Value Representation
+94
+85
+70
+45
+20
15:15:15:15:15:15:15:15 15:12:11:10:9:8:7:6
15:14:13:12:11:10:9:8
_______________________________________________________________________________________
RELATIVE TEMP (°C)
RESHI
-10
-25
-50
-75
-1
7:6:5:4:3:2:1:0
RESLO
FFCEh
FFE7h
FFB5h
FFFFh
FFF6h
HEX
The MAX6618 can average several temperature read-
ings and return a value as calculated by:
where T
is the new value read from PECI, and T
stored temperature ready to be returned through I
This calculation can cause significant bits to be lost.
Enable temperature averaging by writing the desired
averaging amount to the CONFIG3 register. Writing 00h
to the CONFIG3 register disables temperature averaging.
Figure 3. Alternate Temperature Representation
T
PECI-to-I
(SIGN BITS)
NEW
RESHI
S
S
X
S
=
OLD
X
S
2
CONFIG
12 11 10
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
S
is the previously stored temperature, T
RESHI
1
S
3
S
x T
S
9
2
PECI
S
8
C Translator
BINARY
+
⎛
⎝ ⎜
INTEGER VALUE (~ 1°C)
RESLO
S
7
Temperature Averaging
1
−
12 11 10
6
2
CONFIG
X
1111 0110
1110 0111
1100 1110
1011 0101
1111 1111
1
FRACTIONAL VALUE
NEW
RESLO
X
X
9
3
is the newly
⎞ ⎞
⎠ ⎟
X
8
x T
OLD
X
7
PECI
2
X
6
C.
9