DS4000GF/WBGA Maxim Integrated Products, DS4000GF/WBGA Datasheet - Page 9

• Manufacturer Part Number: DS4000GF/WBGA
• Description: IC OSC DC-TCXO 16.38400MHZ TCXO
• Manufacturer: Maxim Integrated Products
• Type: Temperature, Compensated Crystal Oscillator (TCXO)r

Specifications of DS4000GF/WBGA

• Frequency: 16.384MHz
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 1.5mA
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 24-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Count: -

DIGITAL TEMPERATURE SENSOR
The digital temperature sensor provides 10-bit temperature readings that indicate the temperature of the device.
Temperature readings are communicated from the DS4000 over a 2-wire serial interface. No additional
components are required. The DS4000 has an external address bit that allows a user to choose the slave address
from two possible values.
The factory-calibrated temperature sensor requires no external components. Upon power-up, the DS4000 starts
performing temperature conversions with a resolution of 10 bits (+0.25°C resolution). Following an 8-bit command
protocol, temperature data can be read over the 2-wire interface. The host can periodically read the value in the
temperature register, which contains the last completed conversion. As conversions are performed in the
background, reading the temperature register does not affect the conversion in progress.
READING TEMPERATURE
The DS4000 measures temperature through the use of an on-chip temperature-measurement technique with an
operation range from 0°C to +70°C (commercial) or -40°C to +85°C (industrial). The device performs continuous
conversions with the most recent result being stored in the temperature register. The digital temperature is
retrieved from the temperature register using the READ TEMPERATURE command, as described in detail in the
following paragraphs.
Table 2 shows the exact relationship of output data to measured temperature. The data is transmitted serially over
the 2-wire serial interface, MSB first. The MSB of the temperature register contains the “sign” (S) bit, denoting
whether the temperature is positive or negative. For Fahrenheit usage, a lookup table or conversion routine must
be used.
TEMPERATURE/DATA RELATIONSHIP (UNIT = °C)
Table 2. Temperature/Data Relationship
Note: Internal power dissipation raises the temperature above the ambient. The delta between ambient and the die temperature depends on
power consumption, PC board layout, and airflow.
TEMPERATURE
MSB
LSB
BIT 7
BIT 7
+0.5
2
(°C)
+85
+75
-0.5
-20
-40
S
-1
0
(64h)
(65h)
BIT 6
BIT 6
2
2
-2
6
0101 0101 0000 0000
0100 1011 0000 0000
0000 0000 1000 0000
0000 0000 0000 0000
1111 1111 1000 0000
1110 1100 0000 0000
1101 1000 0000 0000
DIGITAL OUTPUT
BIT 5
BIT 5
(Binary)
2
0
5
BIT 4
BIT 4
2
0
4
9 of 16
DIGITALOUTPUT
BIT 3
BIT 3
2
0
3
EC00h
4B00h
FF80h
D800h
5500h
0080h
0000h
(hex)
BIT 2
BIT 2
2
0
2
BIT 1
BIT 1
2
0
1
BIT 0
BIT 0
2
0
0