DS75U+T&R【PDF 10/14 页】IC THERMOMETER/STAT DIG 8-MSOP

DS75

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Table 6. Fault Tolerance Configuration

CONSECUTIVE OUT-OF-LIMITS

CONVERSIONS TO TRIGGER O.S.

The four DS75 registers each have a unique two-bit pointer designation, which is defined in Table 7.

When reading from or writing to the DS75, the user must point the DS75 to the register that is to be

accessed. When reading from the DS75, once the pointer is set, it will remain pointed at the same register

until it is changed. For example, if the user desires to perform consecutive reads from the temperature

automatically be from the temperature register until the pointer value is changed. On the other hand,

when writing to the DS75, the pointer value must be refreshed each time a write is performed even if the

same register is being written to twice in a row.

At power-up, the default pointer value is the temperature register so the temperature register can be read

immediately without resetting the pointer.

Changes to the pointer setting are accomplished as described in the 2-WIRE SERIAL DATA BUS section

of this datasheet.

Table 7. POINTER DEFINITION

P1 P0

Temperature

Configuration

HYST

2-WIRE SERIAL DATA BUS

The DS75 communicates over a standard bi-directional 2-wire serial data bus that consists of a serial

clock (SCL) signal and serial data (SDA) signal. The DS75 interfaces to the bus via the SCL input pin

and open-drain SDA I/O pin. All communication is MSb first.

The following terminology is used to describe 2-wire communication:

Master Device: Microprocessor/microcontroller that controls the slave devices on the bus. The master

device generates the SCL signal and START and STOP conditions.

Slave: All devices on the bus other than the master. The DS75 always functions as a slave.

Bus Idle or Not Busy: Both SDA and SCL remain high. SDA is held high by a pullup resistor when the

bus is idle, and SCL must either be forced high by the master (if the SCL output is push-pull) or pulled

high by a pullup resistor (if the SCL output is open-drain).

Transmitter: A device (master or slave) that is sending data on the bus.

Receiver: A device (master or slave) that is receiving data from the bus.

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