MAX6657MSA Maxim Integrated Products, MAX6657MSA Datasheet - Page 14

• Manufacturer Part Number: MAX6657MSA
• Description: Board Mount Temperature Sensors
• Manufacturer: Maxim Integrated Products

Specifications of MAX6657MSA

• Full Temp Accuracy: +/- 5 C
• Package / Case: SOIC-8 Narrow
• Digital Output - Bus Interface: Serial (2-Wire, I2C)
• Digital Output - Number Of Bits: 10 bit + Sign
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Output Type: Digital
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

±1°C, SMBus-Compatible Remote/Local Temperature
Sensors with Overtemperature Alarms
control can be used to reduce the supply current in
portable-equipment applications. The conversion rate
byte’s POR state is 08h (16Hz). The MAX6657/
MAX6658/MAX6659 use only the 4 least-significant bits
(LSBs) of this register. The 4 most-significant bits
(MSBs) are “don’t care” and should be set to zero when
possible. The conversion rate tolerance is ±25% at any
rate setting.
Valid A/D conversion results for both channels are
available one total conversion time (125ms nominal,
156ms maximum) after initiating a conversion, whether
conversion is initiated through the RUN/STOP bit, hard-
ware STBY pin, one-shot command, or initial power-up.
The MAX6657/MAX6658 have a fixed address of
1001100. The MAX6659 can be programmed to have
one of three different addresses, allowing up to three
devices to reside on the same bus without address
conflicts. Table 8 lists address information.
The address pin state is checked at POR only, and the
address data stays latched to reduce quiescent supply
current due to the bias current needed for high-Z state
detection.
The MAX6657/MAX6658/MAX6659 also respond to the
SMBus Alert Response slave address (see Alert
Response Address section).
The MAX6657/MAX6658/MAX6659 have a volatile
memory. To prevent unreliable power-supply conditions
Table 7. Conversion-Rate
Control Byte
Note: Extended resolution applies only for conversion rates of
4Hz or slower.
14
______________________________________________________________________________________
0Ah-FFh
DATA
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
CONVERSION RATE (Hz)
Slave Addresses
POR and UVLO
Reserved
0.0625
0.125
0.25
0.5
16
16
1
2
4
8
from corrupting the data in memory and causing erratic
behavior, a POR voltage detector monitors V
clears the memory if V
Electrical Characteristics ). When power is first applied
and V
operating, although reads and writes at V
below 3.0V are not recommended. A second V
parator and the ADC undervoltage lockout (UVLO)
comparator prevent the ADC from converting until there
is sufficient headroom (V
Power-up defaults include:
•
•
•
•
•
•
•
Table 8. Slave Address Decoding for
MAX6659
Table 9. Read Format for Alert Response
Address (000 1100)
7 (MSB)
0 (LSB)
BIT
ADC begins autoconverting at a 16Hz rate (legacy
resolution).
THIGH and TLOW registers are set to default limits,
respectively.
Interrupt latch is cleared.
Address-select pin is sampled (MAX6659 only).
Command register is set to 00h to facilitate quick
internal Receive Byte queries.
Hysteresis is set to 10°C.
Transistor type is set to a substrate or common col-
lector PNP.
6
5
4
3
2
1
ADD CONNECTION
CC
Unconnected
rises above 2.0V (typ), the logic blocks begin
GND
V
NAME
CC
ADD7
ADD6
ADD5
ADD4
ADD3
ADD2
ADD1
1
CC
CC
Provide the current
MAX6659 slave address
that was latched at POR
(Table 8)
Logic 1
= +2.8V typ).
falls below 1.7V (typ, see
Power-Up Defaults
FUNCTION
ADDRESS
1001100
1001110
1001101
CC
CC
CC
levels
com-
and