DS1616S データシートの表示（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1616S

Temperature and Three Input MUX’ed 8-bit Data Recorder

Dallas Semiconductor -> Maxim Integrated 

TEMPERATURE DATA BYTE FORMAT Table 1

MSb

LSb

T7 T6 T5 T4 T3 T2 T1 T0

DS1616

When a datalog mission has been initiated and the thermal sensor is enabled (CS0=1), the DS1616

provides temperature recording at regular intervals. However, the device also allows for immediate

temperature sensing upon a user’s command when the device is not currently on a datalog mission and

the thermal sensor is enabled (CS0=1). This is accomplished by issuing the Read Data command to the

DS1616 over the serial interface.

The most recently recorded temperature value is written to the Current Temperature register, regardless of

whether that value was recorded from a datalog mission or from the issuance of the Read Data command.

The status of the contents of this register is provided by the Data Ready (DR) bit in the Status 1 register.

If DR is a logic 1, the data is valid. If DR is a logic 0, the data may not be reliable. If CS0 in the Control

2 register is a 0 such that the thermal sensor is disabled, the value in the Current Temperature register will

be 11111111b. The Read Data command will not output this byte of data.

During a datalog mission, the DR bit is cleared to a logic 0 when a temperature conversion has been

initiated and is set to a logic 1 upon the completion of the conversion. Likewise, the DR bit is cleared

immediately after the Read Data command is issued and is set to a logic 1 upon the completion of the

conversion. The Read Data command will only read the values in the current temperature/ADC data that

have been enabled by the CSx[03] bits in the control 2 register.

ANALOG-TO-DIGITAL CONVERTER (ADC)

The DS1616 contains an integrated 8-bit ADC with a 3 to 1 input mux to allow multiple sensors to be

monitored. An on-chip voltage reference is also provided by an integrated band gap circuit (2.04V ±3%).

The ADC input voltage must not be greater than the battery voltage.

An analog-to-digital conversion is the process of assigning a digital value to an analog input voltage.

This code represents the input value as a fraction of the full scale voltage (FSV) range. Thus the FSV

range is then divided by the ADC into 256 codes (8 bits). The FSV range is bounded by an upper limit

equal to the reference voltage and the lower limit which is ground. The 2.04V (typical) bandgap

reference provides a resolution of 8mV between codes.

An input voltage equal to the reference voltage converts to FFh while an input voltage equal to ground

converts to 00h. The relative linearity of the ADC is ±0.5 LSB.

When a datalog mission has been initiated and one or more of the Analog Inputs are enabled (CS[1-3] =

1), the DS1616 provides data conversion and recording at regular intervals. However, the device also

allows for immediate data conversion upon a user’s command when the device is not currently

performing a conversion and one or more of the Analog Inputs are enabled (CS[1-3] = 1). This is

accomplished by issuing the Read Data command to the DS1616 over the serial interface.

The most recently recorded data value is written to the Current Data register that corresponds to the

analog channel(s) that is(are) enabled, regardless of whether that value was recorded from a datalog

mission or from the issuance of the Read Data command. The status of the contents of this register is

provided by the Data Ready (DR) bit in the Status 1 register. If DR is a logic 1, the data is valid. If DR is

a logic 0, the data may not be reliable. If a channel is not enabled, CS[1-3] is a logic 0, the contents of

the corresponding Current Data register will be 00000000b and not outputted when a Read Data

command is issued.

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