MAX1098-MAX1099 Datasheet, PDF (15/20 Pages) Maxim Integrated Products – 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC

10-Bit Serial-Output Temperature Sensors
with 5-Channel ADC
Table 1. Configuration-Byte Format
BIT 7
(MSB)
Start
BIT 6
0
BIT 5
0
BIT 4
0
BIT 3
0
BIT 2
PM1
BIT 1
PM0
BIT 0
(LSB)
REF
BIT
7 (MSB)
6, 5, 4, 3
2, 1
0
NAME
Start
PM1, PM0
REF
DESCRIPTION
First logic 1 after CS goes low. (See Input Data Format.)
Must be 0000 to load a configuration byte.
These 2 bits select the desired power mode (Table 3).
A logic high enables the internal reference. A logic low disables the internal reference and
selects the external reference mode.
Table 2. Conversion-Byte Format
BIT 7
(MSB)
Start
BIT 6
0
BIT 5
1
BIT 4
0
BIT 3
SEL3
BIT 2
SEL2
BIT
7 (MSB)
6, 5, 4
3, 2, 1, 0
NAME
Start
SEL3, SEL2,
SEL1, SEL0
DESCRIPTION
First logic 1 after CS goes low. (See Input Data Format.)
Must be 010 to load a conversion byte.
These 4 bits select the input configuration (Table 4).
BIT 1
SEL1
BIT 0
(LSB)
SEL0
CSB
t_CSH
SSTRB
t_CONV
t_SSTRB
t_CSS
t_SCK
SCLK
PDO CLOCKED IN
t_DO
DOUT
SSTRB TIMING
Figure 6. Detailed SSTRB Timing
Reference Selection
Select between internal and external voltage modes
through bit REF of the configuration byte. Set REF = 1
for internal reference mode and REF = 0 for external
reference mode.
Internal Reference
The MAX1098 has a 2.50V internal reference, while the
MAX1099 has a 1.20V internal reference. Both are fac-
tory trimmed for accuracy. When internal reference is
selected, REF can be used to drive an external load
with 100µA capability. Bypass REF to GND with a 0.1µF
minimum capacitance. Wake-up time is C x 2.5 x 10⁴s
for the MAX1098 and C x 1.2 x 10⁴s for the MAX1099.
External Reference
The MAX1098 can directly accept reference voltages at
REF from 0.8V to 2.5V, while the MAX1099 can directly
accept reference voltages from 0.8V to 1.2V. Bypass
REF to GND with a 0.1µF capacitor. Temperature mea-
surements always use internal reference.
Power Modes
The MAX1098/(MAX1099) typically requires supply cur-
rents of 380µA (350µA) or 310µA (280µA) when per-
forming voltage conversions at 100% duty cycle with
internal or external references, respectively. The differ-
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