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±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
General Description
The MAX30208 operates from a 1.7V to 3.6V supply
voltage, and is a low-power, high-accuracy digital temperature sensor with ±0.1°C accuracy from +30°C to
+50°C and ±0.15°C accuracy from 0°C to +70°C. The
MAX30208 has 16-bit resolution (0.005°C).
The device uses a standard I2C serial interface to communicate with a host controller. Two GPIO pins are available. GPIO1 can be configured to trigger a temperature
conversion, while GPIO0 can be configured to generate
an interrupt for selectable status bits.
The MAX30208 includes a 32-word FIFO for the temperature data and also includes high and low threshold digital
temperature alarms. The device is available in a 2mm x
2mm x 0.75mm, 10-pin Thin LGA package.
Applications
●● Wearable Body Temperature Monitors
●● Medical Thermometers
●● Internet of Things (IoT) Sensors
Benefits and Features
●● High Accuracy and Precision
• ±0.1°C Accuracy from +30°C to +50°C
• ±0.15°C Accuracy from +0°C to +70°C
●● Low Power Consumption
• 1.7V to 3.6V Operating Voltage
• 67μA Operating Current During Measurement
• 0.5μA Standby Current
• 15ms Integration Time
●● Small Size
• 2mm x 2mm x 0.75mm, 10-Pin Thin LGA
●● Safety and Compliance
• High and Low Temperature Alarms
●● Digital Interface
• Configurable Convert Temperature Input Pin
• Configurable Interrupt Output Pin
• 32-Word FIFO for Temperature Data
• 4 I2C Addresses Available—More Addresses
Available by Request
• Unique ROM IDs Allow Device to be NIST
Traceable
Ordering Information appears at end of data sheet.
Simplified Block Diagram
Accuracy Error vs. Temperature
200
MAX30208
SCL
I2C
INTERFACE
GND
TEMP
SENSOR
CONTROL
LOGIC
REGISTERS
GPIO1
GPIO0
VDD
ACCURACY ERROR (m°C)
SDA
150
+ 3 SIGMA
100
AVERAGE
50
0
-50
- 3 SIGMA
-100
-150
-200
0
10
20
30
40
50
60
TEMPERATURE (°C)
(VDD = 1.8V, 32 DUTs, POST PCB REFLOW)
19-100550; Rev 1; 5/20
70
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Absolute Maximum Ratings
VDD to GND.............................................................-0.3V to +6V
GPIO0 to GND.........................................................-0.3V to +6V
GPIO1 to GND ....................................................... -0.3V to VDD
SDA,SCL to GND.....................................................-0.3V to +6V
Operating Temperature Range..................................0°C to 70°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -55°C to +125°C
Lead Temperature (soldering, 10s) ................................. +220°C
Soldering Temperature (reflow)........................................+220°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
PACKAGE TYPE: 10-PIN THIN LGA
Package Code
L1022+2
Outline Number
21-100265
Land Pattern Number
90-100101
THERMAL RESISTANCE, SINGLE-LAYER BOARD:
Junction to Ambient (θJA)
241.30°C/W
Junction to Case (θJC)
53.90°C/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(VDD = 1.8V, TA = 25°C, min/max are from TA = 0°C to +70°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TEMPERATURE SENSOR
post reflow, 3 sigma
-0.1
+0.1
post reflow, 6 sigma
-0.2
+0.2
post reflow, 6 sigma
-0.3
Temperature
Measurement Error
+30°C to +50°C
Resolution
16-Bit
Repeatability
VDD = 1.8V, 1sps, 120 samples
+0°C to +70°C
Response Time
TA = +0°C to +50°C
Long Term Stability
Supply Voltage
DC Power Supply
Rejection Ratio
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VDD
PSRR
Guaranteed by PSRR
TA = +25°C
+0.3
0.005
°C
0.008
°C RMS
Unmounted, 63%
(Note 2)
0.5
Mounted, 63% (Note 2)
3.5
Mounted, TA = 70°C, 0% RH
°C
s
0.015
1.7
°C/1000hrs
3.6
0.006
V
°C/V
Maxim Integrated │ 2
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Electrical Characteristics (continued)
(VDD = 1.8V, TA = 25°C, min/max are from TA = 0°C to +70°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
Operating Current
CONDITIONS
TYP
MAX
VDD = 3.6V
68
100
VDD = 1.8V
67
100
VDD = 3.6V, TA = +25°C
0.5
1.0
VDD = 3.6V, TA = +70°C
0.7
3
During Conversion
Standby Current
MIN
UNITS
μA
μA
GPIO PINS
Input Voltage Low
VIL_GPIO
Input Voltage High
VIH_GPIO
Input Hysteresis
0.4
1.4
VHYS_GPIO
Input Leakage Current
IIN_GPIO
Input Capacitance
CIN_GPIO
0.01
mV
1
10
Input Low Pulse Width
Output Low Voltage
V
320
VIN = 0V, TA = +25°C
μA
pF
5
VOL_GPIO
V
μS
ISINK = 2mA
0.4
V
0.4
V
I2C / DIGITAL I/O CHARACTERISTICS
Input Voltage Low
VIL
Input Voltage High
VIH
Input Hysteresis
Input Capacitance
Open Drain Output Low
Voltage
1.4
V
VHYS
200
mV
CIN
10
pF
VOL_OD
ISINK = 6mA, SDA Pin Only
0.4
V
I2C / TIMING CHARACTERISTICS (Note 3)
I2C Write Address
GPIO1 = GPIO0 = 0V. See Table 3
A0
Hex
I2C Read Address
GPIO1 = GPIO0 = 0V. See Table 3
A1
Hex
Serial Clock Frequency
fSCL
0
Bus Free Time Between
STOP and START
Conditions
tBUF
1.3
µs
Hold Time START and
Repeat START Condition
tHD,STA
0.6
µs
SCL Pulse-Width Low
tLOW
1.3
µs
SCL Pulse-Width High
tHIGH
0.6
µs
Setup Time for a Repeated
START Condition
tSU_STA
0.6
µs
Data Hold Time
tHD_DAT
0
Data Setup Time
tSU_DAT
100
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400
900
kHz
ns
ns
Maxim Integrated │ 3
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Electrical Characteristics (continued)
(VDD = 1.8V, TA = 25°C, min/max are from TA = 0°C to +70°C, unless otherwise noted.) (Note 1)
PARAMETER
Setup Time for STOP
Condition
SYMBOL
tSU_STO
CONDITIONS
MIN
TYP
MAX
0.6
UNITS
µs
Pulse Width of Suppressed Spike
tSP
50
ns
Bus Capacitance
CB
400
pF
SDA and SCL Receiving
Rise Time
tR
20 +
0.1CB
300
ns
SDA and SCL Receiving
Fall Time
tF
20 +
0.1CB
300
ns
SDA Transmitting Fall
Time
tTF
20 +
0.1CB
300
ns
Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by Maxim
Integrated bench or proprietary automated test equipment (ATE) characterization.
Note 2: Unmounted: Part is on single-layer flex PCB.
Mounted: Part is on a 2-layer PCB.
Note 3: For design guidance only. Not production tested.
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Maxim Integrated │ 4
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Typical Operating Characteristics
(VDD = +1.8V, TA = 25°C, unless otherwise noted.)
CONVERSION CURRENT vs. TEMPERATURE
STANDBY CURRENT vs. TEMPERATURE
toc01
VDD = 3.6V
VDD = 3.3V
VDD = 2.7V
VDD = 1.8V
1.6
1.4
CURRENT (µA)
1.0
0.8
100
VDD = 3.6V
VDD = 3.3V
VDD = 2.7V
VDD = 1.8V
68
1.2
CURRENT (μA)
toc02
69
CURRENT (µA)
1.8
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE
(TA = 25°C)
67
0.6
toc03
VDD = 3.6V
VDD = 3.3V
VDD = 2.7V
VDD = 1.8V
10
1
66
0.4
0.2
0
10
20
30
40
50
60
65
70
0
10
20
SAMPLE-TO-SAMPLE REPEATABILITY
(1 SIGMA FOR 120 SAMPLES AT 1Hz, 32 DUTs)
50
60
0.1
70
8
7
ACCURACY ERROR vs. TEMPERATURE
(VDD = 1.8V, 32 DUTs, POST PCB REFLOW)
toc05
200
AVERAGE
50
0
-50
- 3 SIGMA
-100
10
20
30
40
50
60
-200
70
TEMPERATURE (°C)
ACCURACY ERROR (m°C)
150
100
AVERAGE
0
-50
- 3 SIGMA
-100
AVERAGE
50
0
-50
- 3 SIGMA
-100
10
20
30
40
50
60
70
0
ACCURACY ERROR vs. TEMPERATURE
(VDD = 3.6V, 32 DUTs, POST PCB REFLOW)
toc08
AVERAGE
0
-50
- 3 SIGMA
10
20
30
40
50
TEMPERATURE (°C)
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60
70
10
40
50
60
70
toc09
VDD = 3.3V FLEX
VDD = 1.8V FLEX
VDD = 3.3V PCB
VDD = 1.8V PCB
10
1
0.01
0
30
0.1
-100
-200
0
20
SELF HEATING vs. CONVERSION RATE
(TA = 25°C, STILL AIR)
100
+ 3 SIGMA
100
50
10
TEMPERATURE (°C)
FLEX 3mm x 150mm, SINGLE LAYER PCB
20mm x 33mm x 1.6mm, 2 LAYER
-150
-150
-200
+ 3 SIGMA
100
-200
0
150
+ 3 SIGMA
50
200
ACCURACY ERROR (m°C)
200
100
ACCURACY ERROR vs. TEMPERATURE
(VDD = 2.7V, 32 DUTs, POST PCB REFLOW)
toc06
TEMPERATURE (°C)
ACCURACY ERROR vs. TEMPERATURE
(VDD = 3.3V, 32 DUTs, POST PCB REFLOW)
toc07
10
-150
SELF HEATING (m°C)
0
1
150
+ 3 SIGMA
100
-150
6
0.1
CONVERSION RATE(Hz)
150
ACCURACY ERROR (m°C)
REPEATABILITY (m°C)
200
toc04
VDD = 3.6V
VDD = 3.3V
VDD = 2.7V
VDD = 1.8V
9
40
TEMPERATURE (°C)
TEMPERATURE (°C)
10
30
ACCURACY ERROR (m°C)
0.0
20
30
40
50
60
70
0.1
1
10
CONVERSION RATE(Hz)
TEMPERATURE (°C)
Maxim Integrated │ 5
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Pin Configuration
TOP VIEW
VDD
1
MAX30208
7
6
GND
5
GND
4
GND
GPIO1
8
VDD
2
SDA
9
SCL
VDD
3
10
GPIO0
THIN LGA
(2mm x 2mm x 0.75mm)
Pin Description
PIN
NAME
FUNCTION
Power
1, 2, 3
VDD
Power. +1.7V to +3.6V. Connect 0.1μF capacitor connected to ground.
4, 5, 6
GND
Ground Reference.
8
SDA
I2C Data Input and Output
9
SCL
I2C Clock
I2C
GPIO
7
GPIO1
General Purpose Input/Output 1. State at each I2C start condition can be used to configure I2C addresses, see Table 2 & Table 3. Can be configured to act as an external temperature convert input.
10
GPIO0
General Purpose Input/Output 0. State at each I2C start condition can be used to configure I2C addresses, see Table 2 & Table 3. Can be configured as an interrupt output.
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Maxim Integrated │ 6
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Functional Diagram
1.7V to 3.6V
RSDA
4.7kΩ
VDD
SDA
SCL
MCU
GND
SDA
SCL
GND
Detailed Description
The MAX30208 temperature sensor measures temperature with ±0.1°C accuracy over a +30°C to +50°C
temperature range and ±0.15°C accuracy over a 0°C
to +70°C temperature range. The device communicates
over a standard I2C interface with serial data (SDA) and
serial clock (SCL) lines to read the FIFO, which contains
up to 32, 2-byte temperature readings. The device operates properly over a -40°C to +85°C temperature range
without any damage.
In addition to the FIFO, the memory mapped registers
contain high-alarm and low-alarm trigger registers and a
temperature sensor setup register. The temperature sensor provides a 16-bit ADC. The Alarm High, Alarm Low,
and Setup registers are volatile, and do not retain data
when the device is powered down.
The MAX30208 has two GPIO pins. The default state of
the GPIO pins at powerup determines the 2 LSBs in the
I2C address of the device. GPIO1 allows for an optional
external convert temperature trigger while GPIO0 can be
configured as an interrupt for selectable status bits.
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MAX30208
RSCL
4.7kΩ
I2C
INTERFACE
TEMP
SENSOR
CONTROL
LOGIC
REGISTERS
GPIO1
GPIO0
VDD
CVDD
0.1µF
Operation
Measurement Considerations
Key parameters affecting the performance of temperature sensors are the thermal conductivity from the IC to
the board and from the IC to the air. A conventional surface-mount temperature sensor IC has high thermal conductivity to the circuit board on which it is mounted. Heat
travels from the board through the package leads to the
sensor die. Although air temperature also affects die temperature, the sensor plastic package does not conduct
heat as well as its leads. Therefore, board temperature
has a greater influence on the measured temperature.
●● Place the sensor as close as possible to the target
temperature to be measured and create a good thermal contact with the top of the package.
●● Use traces that are as thin as possible to minimize
the thermal conduction away from the sensor.
●● Best results are obtained when the device is mounted on a flexible kapton PCB.
Maxim Integrated │ 7
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Measuring Temperature
The device powers up in a low-power standby state. To
initiate a temperature measurement the master must write
a ‘1’ to the CONVERT_T bit in the TEMP_SENSOR_
SETUP[0x14] register. Do not sample at more than 20Hz,
as the total time for a sample to be ready after sending a
conversion command can be up to 50ms. Following the
conversion, which takes 15ms(typ), the resulting temperature data is store in the FIFO and the device returns to the
standby state. CONVERT_T automatically clears to ‘0.’
The output temperature data is calibrated in degrees
Celsius. The temperature data is stored as a left-justified,
16-bit sign-extended two’s complement number in the
FIFO Data register (see Figure 1). The data is two’s complement where the MSB determines the sign of the temperature with an MSB of 1 indicating a negative temperature and an MSB of 0 indicating a positive temperature.
To calculate the temperature from the measurement
result, convert the two’s complement value to the decimal
value and use the following equation for all bit resolutions.
T = Decimal Value × 0.005
For example, if the result is 0x1CE8, convert to decimal
to get 7400, then T = 7400 × 0.005 or 37°C. Table 1 gives
examples of digital output data and the corresponding
temperature reading.
FIFO DATA REGISTER FORMAT
MSB
LSB
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
T15
T14
T13
T12
T11
T10
T9
T8
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
T7
T6
T5
T4
T3
T2
T1
T0
Figure 1. Temperature Data Register Format
Table 1. FIFO Data Format
TEMPERATURE (°C)
DIGITAL OUTPUT (BINARY) DIGITAL OUTPUT (HEXADECIMAL) DIGITAL OUTPUT (DECIMAL)
+70
0011 0110 1011 0000
36B0
14,000
+50
0010 0111 0001 0000
2710
10,000
+41
0010 0000 0000 1000
2008
8,200
+37
0001 1100 1110 1000
1CE8
7,400
+35.8
0001 1011 1111 1000
1BF8
7,160
+25
0001 0011 1000 1000
1388
5,000
+15
0000 1011 1011 1000
0BB8
3,000
+0.04
0000 0000 0000 1000
0008
8
+0.02
0000 0000 0000 0100
0004
4
+0.01
0000 0000 0000 0010
0002
2
+0.005
0000 0000 0000 0001
0001
1
0
0000 0000 0000 0000
0000
0
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Maxim Integrated │ 8
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Alarm Signaling
After the device performs a temperature conversion, the
temperature value is compared with the user-defined
two’s complement alarm trigger values stored in the 2-byte
Alarm High and 2-byte Alarm Low registers (see Figure 2).
The default value for AH is 0x7FFF (+163.835°C) and the
default value for AL is 0x8000 (-163.840°C). The MSB
indicates if the value is positive or negative; for positive
numbers the MSB is 0 and for negative numbers the
MSB is 1. The alarm high threshold, AH is programmed
in registers ALARM_HI_MSB [0x10] and ALARM_HI_
LSB [0x11]. The alarm low threshold, AL is programmed in
registers ALARM_LO_MSB [0x12] and ALARM_LO_LSB
[0x13].
If the measured temperature is lower than AL or higher
than AH, an alarm condition exists and corresponding
status bit, TEMP_LO or TEMP_HI is set in the STATUS
[0x00] regsiter. When the alarm condition is detected and
the corresponding interrupt enable bit, TEMP_LO_EN or
TEMP_HI_EN is set in the INTERRUPT_ENABLE [0x01]
register and if GPIO0_MODE in the GPIO_SETUP [0x20]
register is set to 0x3 then a hardware interrupt asserts
on the GPIO0 pin. The status bits, the alarm flag and the
hardware interrupt stay asserted until the STATUS [0x00]
register is read using the serial interface. The alarm flag
only clears when STATUS is read. If the alarm flag is set
and the next result does not trip the flag, then the flag
remains set.
If the alarm settings change while the device is under an
alarm condition, the alarm status must be cleared and
another temperature conversion executed to update the
alarm condition.
ALARM HIGH THRESHOLD REGISTER FORMAT
MSB
LSB
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
AH15
AH14
AH13
AH12
AH11
AH10
AH9
AH8
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
AH7
AH6
AH5
AH4
AH3
AH2
AH1
AH0
ALARM LOW THRESHOLD REGISTER FORMAT
MSB
LSB
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
AL15
AL14
AL13
AL12
AL11
AL10
AL9
AL8
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
AL7
AL6
AL5
AL4
AL3
AL2
AL1
AL0
Figure 2. Alarm Threshold Register Format
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Maxim Integrated │ 9
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
The state of GPIO pins at each I2C start condition is used
to determine the last two bits of the I2C address. This use
of the GPIO pins is further detailed below in the I2C Slave
Address section.
GPIO
The MAX30208 provides access to two GPIO pins which
can be used to provide additional functionality. GPIO0
can be configured to output an interrupt while GPIO1 can
be configured as an input for a temperature conversion.
The interrupt on GPIO0 is triggered based on selectable
status bits in the INTERRUPT_ENABLE[0x01] register.
By writing to one of the availabe bits in the INTERRUPT_
ENABLE register, the flag for an interrupt is raised if
GPIO0_MODE[1:0] in the GPIO_SETUP [0x20] register is
set to 11. When GPIO1_MODE[7:0] in the GPIO_SETUP
register is set to 11, driving the line low initiates an external temperature conversion. Table 2 shows a complete list
of the functions of the two GPIO Pins.
I2C
I2C Slave Address
I2C Slave Address is 8 bits as shown in Table 3. Bit 0 is 0
for a write operation and 1 for a read operation.
At powerup, GPIO0 and GPIO1 are set to mode 10 as
shown in Table 3. The I2C address is determined by the
state of these pins. If the mode of either of the GPIO
pins is changed to 01 or 11 then those address pins are
automatically pulled low internally and can change the
I2C address.
Table 2. GPIO Mode Functions
GPIOX_MODE[1:0] (X = 0, 1)
GPIO0
GPIO1
00
HiZ Input
HiZ Input
01
Output
Output
10 (default)
1MΩ Internal Pulldown Input
1MΩ Internal Pulldown Input
11
INTB
CONV
Table 3. I2C Slave Address
I2C ADDRESS
W/R
GPIO STATES
7
6
5
4
3
2
1
0
1
0
1
0
0
GPIO1
GPIO0
0/1
10
10
Default state at powerup
1
0
1
0
0
GPIO1
GPIO0
0/1
00
00
Both GPIO1 and GPIO0 are inputs
1
0
1
0
0
GPIO1
GPIO0
0/1
10
00
Both GPIO1 and GPIO0 are inputs
1
0
1
0
0
GPIO1
GPIO0
0/1
00
10
Both GPIO1 and GPIO0 are inputs
1
0
1
0
0
GPIO1
0
0/1
00
01
GPIO1 is an input, GPIO0 is an output
1
0
1
0
0
GPIO1
0
0/1
00
11
GPIO1 is an input, GPIO0 is an output
1
0
1
0
0
GPIO1
0
0/1
10
01
GPIO1 is an input, GPIO0 is an output
1
0
1
0
0
GPIO1
0
0/1
10
11
GPIO1 is an input, GPIO0 is an output
1
0
1
0
0
0
GPIO0
0/1
01
00
GPIO1 is an output, GPIO0 is an input
1
0
1
0
0
0
GPIO0
0/1
01
10
GPIO1 is an output, GPIO0 is an input
1
0
1
0
0
0
GPIO0
0/1
11
00
GPIO1 is an output, GPIO0 is an input
1
0
1
0
0
0
GPIO0
0/1
11
10
GPIO1 is an output, GPIO0 is an input
1
0
1
0
0
0
0
0/1
01
01
GPIO1 and GPIO0 are outputs
1
0
1
0
0
0
0
0/1
01
11
GPIO1 and GPIO0 are outputs
1
0
1
0
0
0
0
0/1
11
01
GPIO1 and GPIO0 are outputs
1
0
1
0
0
0
0
0/1
11
11
GPIO1 and GPIO0 are outputs
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GPIO0_
MODE[1:0]
CONDITION
GPIO1_
MODE[1:0]
Maxim Integrated │ 10
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
I2C/SMBus Compatible Serial Interface
The MAX30208 features an I2C/SMBus-compatible,
2-wire serial interface consisting of a serial data line
(SDA) and a serial clock line (SCL). SDA and SCL facilitate communication between the MAX30208 and the
master at clock rates up to 400kHz. Figure 3 shows the
2-wire interface timing diagram. The master generates
SCL and initiates data transfer on the bus. The master
device writes data to the MAX30208 by transmitting the
proper slave address followed by the register address
and then the data word. Each transmit sequence is
framed by a START (S) or REPEATED START (Sr) condition and a STOP (P) condition. Each word transmitted
to the MAX30208 is 8-bits long and is followed by an
acknowledge clock pulse. A master reading data from the
MAX30208 transmits the proper slave address followed
by a series of nine SCL pulses. The MAX30208 transmits
data on SDA in sync with the master-generated SCL
pulses. The master acknowledges receipt of each byte
of data. Each read sequence is framed by a START (S)
or REPEATED START (Sr) condition, a not acknowledge,
and a STOP (P) condition. SDA operates as both an input
and an open-drain output. A pullup resistor is required
on SDA. SCL operates only as an input. A pullup resistor is required on SCL if there are multiple masters on
the bus, or if the single master has an open-drain SCL
output. Series resistors in line with SDA and SCL are
optional. Series resistors protect the digital inputs of the
MAX30208 from high voltage spikes on the bus lines, and
minimize crosstalk and undershoot of the bus signals.
Detailed I2C Timing Diagram
The detailed timing diagram is shown in Figure 3.
Bit Transfer
One data bit is transferred during each SCL cycle. The
data on SDA must remain stable during the high period
of the SCL pulse. Changes in SDA while SCL is high are
control signals (see the START and STOP Conditions
section).
START and STOP Conditions
SDA and SCL idle high when the bus is not in use. A master initiates communication by issuing a START condition.
A START condition is a high-to-low transition on SDA with
SCL high. A STOP condition is a low-to-high transition
on SDA while SCL is high (Figure 4). A START condition
from the master signals the beginning of a transmission
to the MAX30208. The master terminates transmission,
and frees the bus, by issuing a STOP condition. The bus
remains active if a REPEATED START condition is generated instead of a STOP condition.
SDA
tSU_STA
tSU_DAT
tLOW
tHD_DAT
tHD_STA
tSP
tBUF
tSU_STO
tHIGH
SCL
tHD_STA
tR
START CONDITION
tF
REPEATED START CONDITION
STOP
CONDITION
START
CONDITION
Figure 3. Detailed I2C Timing Diagram
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Maxim Integrated │ 11
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Early STOP Conditions
the master after each read byte to allow data transfer to
continue. A not-acknowledge is sent when the master
reads the final byte of data from the MAX30208 followed
by a STOP condition.
The MAX30208 recognizes a STOP condition at any point
during data transmission except if the STOP condition
occurs in the same high pulse as a START condition. For
proper operation, do not send a STOP condition during
the same SCL high pulse as the START condition.
I2C Write Data Format
A write to the MAX30208 includes transmission of a
START condition, the slave address with the R/W bit set
to 0, one byte of data to configure the internal register
address pointer, one or more bytes of data, and a STOP
condition. Figure 6 illustrates the proper frame format
for writing one byte of data to the MAX30208. Figure 7
illustrates the frame format for writing n-bytes of data to
the MAX30208.
Acknowledge Bit
The acknowledge bit (ACK) is a clocked 9th bit that the
MAX30208 uses to handshake receipt of each byte of data
when in write mode Figure 5. The MAX30208 pulls down
SDA during the entire master-generated 9th clock pulse
if the previous byte is successfully received. Monitoring
ACK allows for detection of unsuccessful data transfers.
An unsuccessful data transfer occurs if a receiving device
is busy or if a system fault has occurred. In the event
of an unsuccessful data transfer, the bus master retries
communication. The master pulls down SDA during the
9th clock cycle to acknowledge receipt of data when the
MAX30208 is in read mode. An acknowledge is sent by
The master first sends the slave address with the R/W
bit set to 0. This indicates that the master intends to write
data to the MAX30208. The MAX30208 acknowledges
receipt of the address byte during the master-generated
9th SCL pulse.
S
Sr
P
SCL
SDA
Figure 4.: I2C Start (S) , Stop (P), and Repeated Start (Sr) Conditions
S
SCL
1
2
8
9
NOT ACKNOLWEDGE
SDA
ACKNOWLEDGE
Figure 5. I2C Acknowledge Bit
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Maxim Integrated │ 12
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
The second byte transmitted from the master configures the MAX30208's internal register address pointer.
The pointer tells the MAX30208 where to write the
next byte of data. An acknowledge pulse is sent by the
MAX30208 upon receipt of the address pointer data.
isters within one continuous frame. The master signals
the end of transmission by issuing a STOP condition.
The auto-increment feature is disabled when there is an
attempt to write to the FIFO_DATA (0x08) register.
The third byte sent to the MAX30208 contains the data
that is written to the chosen register. An acknowledge
pulse from the MAX30208 signals receipt of the data byte.
The address pointer auto increments to the next register
address after each received data byte. This auto-increment feature allows a master to write to sequential reg-
The master sends the slave address with the R/W bit
set to 1 to initiate a read operation. The MAX30208
acknowledges receipt of its slave address by pulling SDA
low during the 9th SCL clock pulse. A START command
followed by a read command resets the address pointer
to register 0x00.
1
S
0
1
0
0
1/0*
1/0*
R/W
=0
ACK
I2C Read Data Format
A7
A6
A5
SLAVE ID
D7
D6
D5
D4
D3
A4
A3
A2
A1
A0
ACK
REGISTER ADDRESS
D2
D1
D0
ACK
P
DATA BYTE
S = START CONDITION
P = STOP CONDITION
ACK = ACKNOWLEDGE BY THE RECEIVER
* = DEPENDS ON GPIO_MODE (SEE I2C SLAVE ADDRESS TABLE)
INTERNAL ADDRESS POINTER AUTO-INCREMENT
(FOR WRITING MULTIPLE BYTES)
Figure 6. I2C Single Byte Write Transaction
S
1
0
1
0
0
1/0*
1/0*
R/W
=0
ACK
A7
A6
SLAVE ID
D7
D6
D5
D4
D3
A5
D6
D5
D4
D3
A3
A1
A0
ACK
D2
D1
D0
ACK
D2
D1
D0
ACK
A2
REGISTER ADDRESS
D2
D1
D0
ACK
D7
D6
D5
D4
D3
DATA BYTE 2
DATA BYTE 1
D7
A4
D2
D1
D0
ACK
DATA BYTE N
S = START CONDITION
P = STOP CONDITION
ACK = ACKNOWLEDGE BY THE RECEIVER
* = DEPENDS ON GPIO_MODE (SEE I2C SLAVE ADDRESS TABLE)
D7
D6
D5
D4
D3
P
DATA BYTE N
INTERNAL ADDRESS POINTER AUTO-INCREMENT
(FOR WRITING MULTIPLE BYTES)
Figure 7. I2C Multi-Byte Write Transaction
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Maxim Integrated │ 13
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
The first byte transmitted from the MAX30208 contains
the data in register 0x00. Transmitted data is valid on the
rising edge of SCL. The address pointer auto-increments
after each read data byte. This auto-increment feature
allows all registers to be read sequentially within one
continuous frame. The auto_increment feature is disabled
when there is an attempt to read from the FIFO_DATA
register, this allows for burst reading of the FIFO_DATA
register. A STOP condition can be issued after any number of read data bytes. If a STOP condition is issued followed by another read operation, the first data byte to be
read is from register 0x00.
address with the R/W bit set to 0 followed by the register
address. A REPEATED START condition is then sent followed by the slave address with the R/W bit set to 1. The
MAX30208 then transmits the contents of the specified
register. The address pointer auto-increments after transmitting the first byte.
The master acknowledges receipt of each read byte
during the acknowledge clock pulse. The master must
acknowledge all correctly received bytes except the last
byte. The final byte must be followed by a not acknowledge from the master and then a STOP condition. Figure 8
illustrates the frame format for reading one byte from the
MAX30208. Figure 9 illustrates the frame format for reading multiple bytes from the MAX30208.
The address pointer can be preset to a specific register
before a read command is issued. The master presets
the address pointer by first sending the MAX30208 slave
S
1
0
1
0
0
1/0*
1/0*
R/W
=0
ACK
A7
A6
SLAVE ID
SR
1
0
1
0
0
A5
A4
A3
A2
A1
A0
ACK
D1
D0
NACK
REGISTER ADDRESS
1/0*
1/0*
R/W
=0
ACK
D7
D6
D5
D4
D3
D2
P
DATA BYTE
SLAVE ID
S = START CONDITION
SR = REPEATED START CONDITION
P = STOP CONDITION
ACK = ACKNOWLEDGE BY THE RECEIVER
NACK = NOT ACKNOWLEDGE
AM = ACKNOWLEDGE BY THE MASTER
* = DEPENDS ON GPIO_MODE (SEE I2C SLAVE ADDRESS TABLE)
INTERNAL ADDRESS POINTER AUTO-INCREMENT
(FOR WRITING MULTIPLE BYTES)
Figure 8. I2C Single Byte Read Transaction
S
1
0
1
0
0
1/0*
1/0*
R/W
=0
ACK
A7
A6
1
0
1
0
0
1/0*
1/0*
R/W
=0
ACK
D7
D6
D5
D6
D5
D4
D3
A3
A1
A0
ACK
D2
D1
D0
AM
D2
D1
D0
NACK
A2
D4
D3
DATA BYTE 1
SLAVE ID
D7
A4
REGISTER ADDRESS
SLAVE ID
SR
A5
D2
D1
D0
AM
DATA BYTE N-1
S = START CONDITION
SR = REPEATED START CONDITION
P = STOP CONDITION
ACK = ACKNOWLEDGE BY THE RECEIVER
NACK = NOT ACKNOWLEDGE
AM = ACKNOWLEDGE BY THE MASTER
* = DEPENDS ON GPIO_MODE (SEE I2C SLAVE ADDRESS TABLE)
D7
D6
D5
D4
D3
P
DATA BYTE N
INTERNAL ADDRESS POINTER AUTO-INCREMENT
(FOR WRITING MULTIPLE BYTES)
Figure 9. I2C Multi-Byte Read Transaction
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Maxim Integrated │ 14
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
FIFO Description
OVF_COUNTER (address 0x06), Overflow Counter
OVF_COUNTER[4:0] logs the number of words lost if
new words are written after the FIFO is full. This counter
saturates at count value 0x1F. Each time a complete word
is popped from the FIFO, the OVF_COUNTER is reset
to zero. The counter is useful as a debug tool. It should
be read immediately before reading the FIFO in order to
check if an overflow condition has occurred
The FIFO is 32 samples long and is designed for 16-bit
temperature data. The master does a burst read of two
bytes starting at register 0x08 to read one 16-bit temperature sample, referred to as a word, from the FIFO. The
master reads 2N bytes from the FIFO to get N samples.
There are seven registers that control how the FIFO is
configured and read out. These registers are illustrated
below.
FIFO_DATA_COUNT (address 0x07),
FIFO Data Counter
FIFO_WR_PTR (address 0x04), Write Pointer
FIFO_DATA_COUNT[5:0] is a read-only register, which
holds the number of words available in the FIFO for the
master to read. This increments when a new word is pushed
to the FIFO, and decrements when the master reads a word
from the FIFO
FIFO_WR_PTR[4:0] points to the FIFO location where
the next word is written. This pointer advances for each
word pushed on to the FIFO by the internal conversion
process. The write pointer is updated from a 5-bit counter
and wraps around to count 0x00 from count 0x1F.
FIFO_DATA (address 0x08), FIFO Data
FIFO_RD_PTR (address 0x05), Read Pointer
FIFO_DATA[7:0] is a read-only register used to retrieve
data from the FIFO. It is important to burst read the
word from the FIFO. Each word is two bytes. Burst reading two bytes from the FIFO_DATA register advances the
FIFO_RD_PTR by one. This configuration is best illustrated by the examples below.
FIFO_RD_PTR[4:0] points to the location where the next
word of the FIFO is read using the I2C interface. This
advances each time a word is read from the FIFO.
The read pointer can be both read and written to. This
allows a word to be reread from the FIFO if it has not
already been overwritten. The read pointer is updated
from a 5 bit counter and wraps around to count 0x00 from
count 0x1F.
Table 5 shows the temperature data format in the FIFO.
Table 4. FIFO Register Map
ADDRESS
REGISTER NAME
B7
B6
B5
B4
B3
B2
0x04
FIFO Write Pointer
-
-
-
FIFO_WR_PTR[4:0]
0x05
FIFO Read Pointer
-
-
-
FIFO_RD_PTR[4:0]
0x06
FIFO Overflow Counter
-
-
-
0x07
FIFO Data Counter
-
-
B1
B0
FIFO_RO
-
OVF_COUNTER[4:0]
FIFO_DATA_COUNT[5:0]
0x08
FIFO Data
0x09
FIFO Configuration 1
-
-
-
FIFO_DATA[7:0]
0x0A
FIFO Configuration 2
-
-
-
FIFO_A_FULL[4:0]
FLUSH_FIFO FIFO_STAT_CLR
A_FULL_TYPE
Table 5. Temperature FIFO Data Format
FIFO DATA FORMAT (FIFO_DATA[15:0])
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
T15
T14
T13
T12
T11
T10
T9
T8
T7
T6
T5
T4
T3
T2
T1
T0
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Maxim Integrated │ 15
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Table 6 shows the order in which the two bytes of the temperature data are read using the serial interface.
Table 6. FIFO Data Read Format
SAMPLE
NUMBER
Sample N
Sample N+1
Sample N+2
FIFO DATA READ FORMAT
BYTE
NUMBER
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
1
T15
T14
T13
T12
T11
T10
T9
T8
2
T7
T6
T5
T4
T3
T2
T1
T0
1
T15
T14
T13
T12
T11
T10
T9
T8
2
T7
T6
T5
T4
T3
T2
T1
T0
1
T15
T14
T13
T12
T11
T10
T9
T8
2
T7
T6
T5
T4
T3
T2
T1
T0
1
T15
T14
T13
T12
T11
T10
T9
T8
2
T7
T6
T5
T4
T3
T2
T1
T0
…
Sample N+31
FIFO_DATA Read Example
Number of samples available in the FIFO after the last read can be obtained by reading the OVF_COUNTER[4:0] and
FIFO_DATA_COUNT[5:0] registers using the following pseudo-code:
read the OVF_COUNTER register
read the FIFO_DATA_COUNT register
if OVF_COUNTER == 0 //no overflow occurred
NUM_AVAILABLE_SAMPLES = FIFO_DATA_COUNT
else,
NUM_AVAILABLE_SAMPLES = 32 // overflow occurred and data has been lost
FIFO_WR_PTR[4:0] and FIFO_RD_PTR[4:0] are available for debug. They can also be used to calculate the number of
available samples using the following pseudo-code:
If OVF_COUNTER is zero,
NUM_AVAILABLE_WORDS = FIFO_WR_PTR – FIFO_RD_PTR
(Note: pointer wrap around should be taken into account)
else,
NUM_AVAILABLE_WORDS = 32
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Maxim Integrated │ 16
MAX30208
±0.1°C Accurate, I2C Digital Temperature Sensor
FIFO_A_FULL (address 0x09), FIFO Almost Full
The FIFO_A_FULL[4:0] field in the FIFO Configuration 1
[0x09] register sets the watermark for the FIFO and determines when the A_FULL bit in the STATUS [0x00] register is asserted. The A_FULL bit is set when the
FIFO contains 32 minus FIFO_A_FULL[4:0] words. For
example, when FIFO_A_FULL is set to 2, the flag is
set when the 30th word is written to the FIFO. When
the FIFO almost full condition is met, the A_FULL bit
is asserted in the STATUS register. If the A_FULL_EN
bit in the INTERRUPT_ENABLE [0x01] register is set
and GPIO0_MODE = 0x3 in the GPIO_SETUP [0x20]
register, then the interrupt is asserted on the GPIO0 pin.
This condition should prompt the applications processor
to read samples from the FIFO before it fills.
The bus master can read both the FIFO_WR_PTR and
FIFO_RD_PTR to calculate the number of words available in the FIFO, or read the OVF_COUNTER and FIFO_
DATA_COUNT registers, and read as many words as
needed to empty the FIFO.
FIFO_RO (address 0x0A), FIFO Rollover
The FIFO_RO bit in the FIFO Configuration 2 [0x0A] register determines whether a sample is pushed onto the
FIFO or discarded when it is full. If FIFO_RO is enabled
when FIFO is full, old samples are overwritten. If FIFO_
RO is not set, the new sample is discarded and the FIFO
is not updated.
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A_FULL_TYPE (address 0x0A),
Almost Full Type
The A_FULL_TYPE bit defines the behavior of the
A_FULL status bit. If the A_FIFO_TYPE bit is set low,
the A_FULL status bit is asserted when the A_FULL condition is detected and cleared by a STATUS register read,
then reasserts for every sample if the A_FULL condition
persists. If the A_FIFO_TYPE bit is set high, the A_FULL
status bit is asserted only when a new A_FULL condition
is detected. The status bit is cleared by a STATUS register
read and does not reassert for every sample until a new
A_FULL condition is detected.
FIFO_STAT_CLR (address 0x0A),
FIFO Status Clear
The FIFO_STAT_CLR bit defines whether the A_FULL
and TEMP_RDY status bits should clear by a FIFO_DATA
register read. If FIFO_STAT_CLR is set low, A_FULL and
TEMP_RDY status bits are not cleared by a FIFO_DATA
register read but are cleared by STATUS register read. If
FIFO_STAT_CLR is set high, A_FULL and TEMP_RDY
status bits are cleared by a FIFO_DATA register read or a
STATUS register read.
FLUSH_FIFO (address 0x0A)
The FLUSH_FIFO bit is used for flushing the FIFO. The
FIFO becomes empty and the FIFO_WR_PTR[4:0], FIFO_
RD_PTR[4:0], FIFO_DATA_COUNT[5:0] and OVF_
COUNTER[4:0] are reset to zero. FLUSH_FIFO is a
self-clearing bit.
Maxim Integrated │ 17
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Register Map
ADDRESS
NAME
MSB
LSB
INTERRUPT AND STATUS
0x00
STATUS[7:0]
A_FULL
–
–
–
–
TEMP_
LO
TEMP_
HI
TEMP_
RDY
0x01
INTERRUPT ENABLE[7:0]
A_FULL_
EN
–
–
–
–
TEMP_
LO_EN
TEMP_
HI_EN
TEMP_
RDY_EN
0x04
FIFO WRITE POINTER[7:0]
–
–
–
FIFO_WR_PTR[4:0]
0x05
FIFO READ POINTER[7:0]
–
–
–
FIFO_RD_PTR[4:0]
0x06
FIFO OVERFLOW
COUNTER[7:0]
–
–
–
OVF_COUNTER[4:0]
0x07
FIFO DATA COUNTER[7:0]
–
–
0x08
FIFO DATA[7:0]
0x09
FIFO CONFIGURATION 1[7:0]
–
–
–
0x0A
FIFO CONFIGURATION 2[7:0]
–
–
–
FLUSH_
FIFO
FIFO_
STAT_
CLR
A_
FULL_
TYPE
FIFO_
RO
–
SYSTEM CONTROL[7:0]
–
–
–
–
–
–
–
RESET
–
–
–
CONVERT
_T
FIFO
FIFO_DATA_COUNT[5:0]
FIFO_DATA[7:0]
FIFO_A_FULL[4:0]
SYSTEM
0x0C
TEMPERATURE
0x10
ALARM HIGH MSB[7:0]
ALARM_HI_MSB[7:0]
0x11
ALARM HIGH LSB[7:0]
ALARM_HI_LSB[7:0]
0x12
ALARM LOW MSB[7:0]
ALARM_LO_MSB[7:0]
0x13
ALARM LOW LSB[7:0]
ALARM_LO_LSB[7:0]
0x14
TEMP SENSOR SETUP[7:0]
RFU
–
–
GPIO1_MODE[1:0]
–
–
–
–
–
GPIO1_
LL
–
GPIO
0x20
0x21
GPIO SETUP[7:0]
GPIO CONTROL[7:0]
–
–
–
GPIO0_MODE[1:0]
–
GPIO0_
LL
IDENTIFIERS
0x31
PART ID 1[7:0]
PART_ID1[7:0]
0x32
PART ID 2[7:0]
PART_ID2[7:0]
0x33
PART ID 3[7:0]
PART_ID3[7:0]
0x34
PART ID 4[7:0]
PART_ID4[7:0]
0x35
PART ID 5[7:0]
PART_ID5[7:0]
0x36
PART ID 6[7:0]
PART_ID6[7:0]
0xFF
PART IDENTIFIER[7:0]
PART_ID[7:0]
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Maxim Integrated │ 18
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Register Details
STATUS (0x0)
BIT
7
6
5
4
3
2
1
0
Field
A_FULL
–
–
–
–
TEMP_LO
TEMP_HI
TEMP_RDY
Reset
0b0
–
–
–
–
0x0
0x0
0b0
Read Only
–
–
–
–
Read Only
Read Only
Read Only
Access Type
BITFIELD
BITS
DESCRIPTION
7
This is a read-only bit. This bit is cleared when the Interrupt Status 1 Register is read.
It is also cleared when FIFO_DATA register is read, if FIFO_STAT_CLR = 1
2
This bit is asserted when the latest temperature sensor measurement is less than
what is programmed in the Temperature Sensor Alarm Low register. When this bit is
asserted and if the TEMP_LO_EN bit is set to 1 then it asserts the interrupt on the
GPIO0 pin when programmed as an interrupt output. The master needs to read the
status register to determine if the interrupt was asserted by the TEMP_LO status. This
bit is cleared after the STATUS register is read.
1
This bit is asserted when the latest temperature sensor measurement is greater than
what is programmed in the Temperature Sensor Alarm High register. When this bit
is asserted and if the TEMP_HI_EN bit is set to 1 then it asserts the interrupt on the
GPIO0 pin when programmed as an interrupt output. The master needs to read the
status register to determine if the interrupt was asserted by the TEMP_HI status. This
bit is cleared after the STATUS register is read.
0
This bit is asserted when a temperature sensor measurement has completed and
new data is available to be read by the master. When this bit is asserted and if the
TEMP_RDY_EN bit is set to 1, then it asserts the interrupt on the GPIO0 pin when
programmed as an interrupt output. The master needs to read the status register to
determine if the interrupt was asserted by the TEMP_RDY status. This bit is cleared
after the STATUS register is read or after the Temperature Data registers are read.
A_FULL
TEMP_LO
TEMP_HI
TEMP_RDY
INTERRUPT ENABLE (0x1)
BIT
Field
7
5
4
3
2
1
0
TEMP_LO_
EN
TEMP_HI_
EN
TEMP_
RDY_EN
A_FULL_EN
–
–
–
–
0b0
–
–
–
–
0b0
0b0
0b0
Write, Read
–
–
–
–
Write, Read
Write, Read
Write, Read
Reset
Access Type
6
BITFIELD
BITS
DESCRIPTION
A_FULL_EN
7
Set A_FULL_EN to 1 to enable the A_FULL interrupt on GPIO0 when programmed as
an interrupt output. Set A_FULL_EN to 0 to disable the A_FULL interrupt.
TEMP_LO_EN
2
Set TEMP_LO_EN to 1 to enable the TEMP_LO interrupt on the GPIO0 pin when
programmed as an interrupt output. Set TEMP_LO_EN to 0 to disable the TEMP_LO
interrupt.
TEMP_HI_EN
1
Set TEMP_HI_EN to 1 to enable the TEMP_HI interrupt on the GPIO0 pin when
programmed as an interrupt output. Set TEMP_HI_EN to 0 to disable the TEMP_HI
interrupt.
TEMP_RDY_EN
0
Set TEMP_RDY_EN to 1 to enable the TEMP_RDY interrupt on the GPIO0 pin when
programmed as an interrupt output. Set TEMP_RDY_EN to 0 to disable the TEMP_
RDY interrupt.
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Maxim Integrated │ 19
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
FIFO WRITE POINTER (0x04)
7
6
5
Field
BIT
–
–
–
Reset
–
–
–
0x00
Access Type
–
–
–
Read Only
BITFIELD
4
4:0
2
1
0
1
0
1
0
1
0
FIFO_WR_PTR[4:0]
BITS
FIFO_WR_PTR
3
DESCRIPTION
See the FIFO Description section for details.
FIFO READ POINTER (0x05)
7
6
5
Field
BIT
–
–
–
Reset
–
–
–
0x00
Access Type
–
–
–
Write, Read, Ext
BITFIELD
4
4:0
2
FIFO_RD_PTR[4:0]
BITS
FIFO_RD_PTR
3
DESCRIPTION
See the FIFO Description section for details.
FIFO OVERFLOW COUNTER (0x06)
7
6
5
Field
BIT
–
–
–
Reset
–
–
–
0x00
Access Type
–
–
–
Read Only
BITFIELD
4
3
BITS
OVF_COUNTER
2
OVF_COUNTER[4:0]
DESCRIPTION
4:0
See the FIFO Description section for details.
FIFO DATA COUNTER (0x07)
BIT
7
6
Field
–
–
FIFO_DATA_COUNT[5:0]
Reset
–
–
0x00
Access Type
–
–
Read Only
BITFIELD
FIFO_DATA_COUNT
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BITS
5:0
5
4
3
2
DESCRIPTION
See the FIFO Description section for details.
Maxim Integrated │ 20
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
FIFO DATA (0x08)
BIT
7
6
5
Field
4
3
2
1
0
1
0
FIFO_DATA[7:0]
Reset
0x00
Access Type
Read Only
BITFIELD
BITS
FIFO_DATA
7:0
DESCRIPTION
See the FIFO Description section for details.
FIFO CONFIGURATION 1 (0x09)
7
6
5
Field
BIT
–
–
–
Reset
–
–
–
0x0F
Access Type
–
–
–
Write, Read
BITFIELD
4
4:0
2
FIFO_A_FULL[4:0]
BITS
FIFO_A_FULL
3
DESCRIPTION
See the FIFO Description section for details.
FIFO CONFIGURATION 2 (0x0A)
BIT
7
6
5
4
3
2
1
0
FLUSH_
FIFO
FIFO_
STAT_CLR
A_FULL_
TYPE
FIFO_RO
–
Field
–
–
–
Reset
–
–
–
0b0
0b0
0b0
0b0
–
Access Type
–
–
–
Write, Read
Write, Read
Write, Read
Write, Read
–
1
0
BITFIELD
BITS
DESCRIPTION
FLUSH_FIFO
4
See the FIFO Description section for details.
FIFO_STAT_CLR
3
See the FIFO Description section for details.
A_FULL_TYPE
2
See the FIFO Description section for details.
FIFO_RO
1
See the FIFO Description section for details.
SYSTEM CONTROL (0x0C)
BIT
7
6
5
4
3
2
Field
–
–
–
–
–
–
–
RESET
Reset
–
–
–
–
–
–
–
0b0
Access Type
–
–
–
–
–
–
–
Write Only
BITFIELD
RESET
www.maximintegrated.com
BITS
DESCRIPTION
0
Setting this bit to 1 resets all register settings to default values. This is a self-clearing bit.
Maxim Integrated │ 21
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
ALARM HIGH MSB (0x10)
BIT
7
6
5
Field
4
3
2
1
0
ALARM_HI_MSB[7:0]
Reset
0x7F
Access Type
Write, Read
BITFIELD
ALARM_HI_MSB
BITS
DESCRIPTION
7:0
The ALARM_HI_MSB[7:0] bits are the most significant byte of the 16-bit temperature
sensor alarm high bits. The ALARM_HI_MSB[7:0] and the ALARM_HI_LSB[7:0] bits
form the full 16-bit temperature sensor Alarm High threshold. The default for the Alarm
High threshold is 0x7FFF, which is the highest temperature setting and also disables
the alarm.
ALARM HIGH LSB (0x11)
BIT
7
6
5
Field
4
3
2
1
0
ALARM_HI_LSB[7:0]
Reset
0xFF
Access Type
Write, Read
BITFIELD
ALARM_HI_LSB
BITS
DESCRIPTION
7:0
The ALARM_HI_LSB[7:0] bits are the least significant byte of the 16-bit temperature
sensor alarm high bits. The ALARM_HI_MSB[7:0] and the ALARM_HI_LSB[7:0] bits
form the full 16-bit temperature sensor Alarm High threshold. The default for the Alarm
High threshold is 0x7FFF, which is the highest temperature setting and also disables
the alarm.
ALARM LOW MSB (0x12)
BIT
7
6
Field
5
4
3
2
1
0
ALARM_LO_MSB[7:0]
Reset
0x80
Access Type
BITFIELD
ALARM_LO_MSB
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Write, Read
BITS
DESCRIPTION
7:0
The ALARM_LO_MSB[7:0] bits are the most significant byte of the 16-bit temperature
sensor alarm low bits. The ALARM_LO_MSB[7:0] and the ALARM_LO_LSB[7:0] bits
form the full 16-bit temperature sensor Alarm Low threshold. The default for the Alarm
Low threshold is 0x8000, which is the lowest temperature setting and also disables
the alarm.
Maxim Integrated │ 22
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
ALARM LOW LSB (0x13)
BIT
7
6
5
Field
4
3
2
1
0
ALARM_LO_LSB[7:0]
Reset
0x00
Access Type
Write, Read
BITFIELD
ALARM_LO_LSB
BITS
DESCRIPTION
7:0
The ALARM_LO_LSB[7:0] bits are the least significant byte of the 16-bit temperature
sensor alarm high bits. The ALARM_LO_MSB[7:0] and the ALARM_LO_LSB[7:0] bits
form the full 16-bit temperature sensor Alarm Low threshold. The default for the Alarm
Low threshold is 0x8000, which is the lowest temperature setting and also disables
the alarm.
TEMP SENSOR SETUP (0x14)
5
4
3
2
1
0
Field
BIT
7
RFU
–
–
–
–
–
CONVERT_T
Reset
0b11
–
–
–
–
–
0b0
–
–
–
–
–
–
Write, Read
Access Type
BITFIELD
RFU
CONVERT_T
www.maximintegrated.com
6
BITS
7:6
0
DESCRIPTION
These bits are reserved for future use. When writing to this register, these bits must
always be set to 1.
Writing '1' to this field starts temperature measurement. This is a self clearing bit, and
automatically resets to 0 when the temperature measurement completes.
Maxim Integrated │ 23
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
GPIO SETUP (0x20)
BIT
Field
5
4
3
2
GPIO1_MODE[1:0]
7
6
–
–
–
–
0b10
–
–
–
–
0b10
Write, Read
–
–
–
–
Write, Read
Reset
Access Type
BITFIELD
BITS
GPIO1_MODE
GPIO0_MODE
1
0
GPIO0_MODE[1:0]
DESCRIPTION
7:6
00 = Digital input (HiZ). GPIO1 logic level read from the GPIO1_LL bit in the GPIO_
CONTROL register
01 = Digital output (open-drain). Set GPIO1 logic level by writing to the GPIO1_LL bit
in the GPIO_CONTROL register.
10 = Digital input with 1MΩ pulldown
11 = Convert Temperature Input (active low)
1:0
00 = Digital input (HiZ). GPIO0 logic level read from the GPIO0_LL bit in the GPIO_
CONTROL register
01 = Digital output (open-drain). Set GPIO0 logic level by writing to the GPIO0_LL bit
in the GPIO_CONTROL register
10 = Digital input with 1MΩ pulldown
11 = INTB (open-drain, active low)
GPIO CONTROL (0x21)
7
6
5
4
3
2
1
0
Field
BIT
–
–
–
–
GPIO1_LL
–
–
GPIO0_LL
Reset
–
–
–
–
0b0
–
–
0b0
Access Type
–
–
–
–
Write, Read
–
–
Write, Read
BITFIELD
GPIO1_LL
GPIO0_LL
www.maximintegrated.com
BITS
DESCRIPTION
3
If GPIO1 is programmed as a digital output, then set the GPIO1_LL bit to 0 to make
the GPIO1 pin a logic low level or set the corresponding GPIO1_LL bit to 1 to make
the GPIO1 pin a logic high level. A read of the GPIO1_LL bit returns the logic level
on the corresponding GPIO1 pin when the register is read, regardless of the GPIO1
mode.
0
If GPIO0 is programmed as a digital output, then set the GPIO0_LL bit to 0 to make
the GPIO0 pin a logic low level or set the corresponding GPIO0_LL bit to 1 to make
the GPIO0 pin a logic high level. A read of the GPIO0_LL bit returns the logic level
on the corresponding GPIO0 pin when the register is read, regardless of the GPIO0
mode.
Maxim Integrated │ 24
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
PART ID 1 (0x31)
BIT
7
6
5
Field
4
3
2
1
0
1
0
1
0
1
0
PART_ID1[7:0]
Reset
Access
Type
Read Only
BITFIELD
DESCRIPTION
BITS
PART_ID1
7:0
Factory set to unique ID
PART ID 2 (0x32)
BIT
7
6
5
Field
4
3
2
PART_ID2[7:0]
Reset
Access
Type
Read Only
BITFIELD
DESCRIPTION
BITS
PART_ID2
7:0
Factory set to unique ID.
PART ID 3 (0x33)
BIT
7
6
5
Field
4
3
2
PART_ID3[7:0]
Reset
Access
Type
Read Only
BITFIELD
DESCRIPTION
BITS
PART_ID3
7:0
Factory set to unique ID.
PART ID 4 (0x34)
BIT
7
6
Field
5
4
3
2
PART_ID4[7:0]
Reset
Access
Type
BITFIELD
PART_ID4
www.maximintegrated.com
Read Only
DESCRIPTION
BITS
7:0
Factory set to unique ID.
Maxim Integrated │ 25
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
PART ID 5 (0x35)
BIT
7
6
5
Field
4
3
2
1
0
1
0
PART_ID5[7:0]
Reset
Access
Type
Read Only
BITFIELD
DESCRIPTION
BITS
PART_ID5
7:0
Factory set to unique ID.
PART ID 6 (0x36)
BIT
7
6
5
Field
4
3
2
PART_ID6[7:0]
Reset
Access
Type
Read Only
BITFIELD
DESCRIPTION
BITS
PART_ID6
7:0
Factory set to unique ID.
PART IDENTIFIER (0xFF)
BIT
7
6
Field
5
4
3
2
1
0
PART_ID[7:0]
Reset
0x30
Access Type
BITFIELD
PART_ID
www.maximintegrated.com
Read Only
BITS
DESCRIPTION
7:0
Maxim Integrated │ 26
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Typical Application Circuits
MAX30208 Single-Point Temperature Sensing
CVDD
1.71V to 3.6V
RSDA
4.7kΩ
VDD
MCU
0.1µF
RSCL
4.7kΩ
VDD
SDA
SDA
SCL
SCL
MAX30208
GPIO1
GPIO0
GND
GND
MAX30208 Single-Point Temperature Sensing with Special Features
CVDD
1.71V to 3.6V
RSDA
4.7kΩ
VDD
MCU
0.1µF
RSCL
4.7kΩ
VDD
SDA
SDA
SCL
SCL
PORT
PORT
CONVERT T
GPIO1
INTERRUPT
MAX30208
GPIO0
GND
GND
MAX30208 Multi-Point Temperature Sensing with up to 4 I2C Addresses
IDENTIFY UP TO 4 PHYSICAL LOCATIONS USING GPIO AS 4 LOCAL ADDRESS PINS
GPIO[1:0]=0x0
1.71V to 1.89V
RSDA
4.7kΩ
VDD
GPIO[1:0]=0x1
CVDD1
0.1µF
RSCL
4.7kΩ
GPIO[1:0]=0x2
CVDD2
0.1µF
GPIO[1:0]=0x3
CVDD4
0.1µF
CVDD3
0.1µF
SDA
SCL
MCU
VDD
SDA
SCL
GND
www.maximintegrated.com
MAX30208
GND
VDD
GPIO1
SDA
GPIO0
SCL
MAX30208
GND
VDD
GPIO1
SDA
GPIO0
SCL
MAX30208
GND
VDD
GPIO1
SDA
GPIO0
SCL
MAX30208
GPIO1
GPIO0
GND
Maxim Integrated │ 27
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Ordering Information
PART NUMBER
TEMP RANGE
PIN-PACKAGE
MAX30208CLB+
0ºC to +70ºC
10 Pin Thin LGA
MAX30208CLB+T
0ºC to +70ºC
10 Pin Thin LGA
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T Denotes tape-and-reel.
www.maximintegrated.com
Maxim Integrated │ 28
±0.1°C Accurate, I2C Digital Temperature Sensor
MAX30208
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
5/19
Initial release
1
5/20
Updated Accuracy vs. Temperature and Electrical Characteristics sections, and
TOC05–TOC08
DESCRIPTION
—
1–2, 5
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2020 Maxim Integrated Products, Inc. │ 29
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