and Lookup Table

10

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The DS3501 has three specified levels of supply cur-

communications while in the LUT driven mode is speci-

statically in the high-logic level while the DS3501 con-

tinues to function in LUT-driven mode. The third level is

possible current consumption mode.

Standby mode is enabled with CR2.0 = 1. All internal

operations are halted including internal temperature

sensor results. Consequently, WR’s position will not

change, and will remain in the last state that was

and once CR2.0 = 0, the DS3501 will resume normal

operation after the first temperature conversion cycle is

Slave Address Byte and Address Pins

The slave address byte consists of a 7-bit slave

address plus a R/W bit (see Figure 2). The DS3501’s

slave address is determined by the state of the A0 and

A1 address pins. These pins allow up to four devices to

result in a 0 in the corresponding bit position in the

result in a 1 in the corresponding bit positions. For

example, the DS3501’s slave address byte is 50h when

described in detail in the

Description section.

The following terminology is commonly used to describe

Characteristics table for additional information.)

Master device: The master device controls the slave

devices on the bus. The master device generates SCL

clock pulses and START and STOP conditions.

Control Register 2 (CR2)

POWER-UP DEFAULT

00h

MEMORY TYPE

Volatile

0Ah

Reserved

Reserved

Reserved

Reserved

Reserved

TEN

AEN

Standby

bit7

bit0

bit7:3

Reserved

bit2

TEN: Temperature Update Enable bar. This bit is valid only in LUT Mode and LUT Adder Mode.

0 = Normal LUT operation. The WR is automatically loaded with LUTVAL+IVR or LUTVAL following each

temperature conversion.

bit1

AEN: Address Update Enable bar. This bit is valid only in LUT Mode and LUT Adder Mode.

0 = Normal LUT operation. LUTAR (08h) is calculated following each temperature conversion that points to the

corresponding location in the LUT.

1 = Disables automatic updates of LUTAR. This allow the user to directly write to the LUTAR register in order to

exercise LUT values and functionality.

bit0

Standby:

0 = Normal operating mode.

is still active in this state.

0

1

1

0

R/W

A0

A1

0

MSB

LSB

SLAVE ADDRESS*

*THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PINS A0, A1.

Figure 2. DS3501 Slave Address Byte