DS2745 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

DS2745

Low-Cost I2C Battery Monitor

Maxim Integrated 

Table 5. MEMORY MAP

ADDRESS (HEX)

00

Reserved

DESCRIPTION

01

Status/Config Register

02 to 08

Reserved

09 to 0D

Reserved

0A

Temperature Register MSB

0B

Temperature Register LSB

0C

Voltage Register MSB

0D

Voltage Register LSB

0E

Current Register MSB

0F

Current Register LSB

10

Accumulated Current Register MSB

11

Accumulated Current Register LSB

12 to 61

Reserved

61

Offset Bias Register

62

Accumulation Bias Register

63 to FF

Reserved

DS2745 Low-Cost I2C Battery Monitor

READ/WRITE

—

R/W

—

—

R

R

R

R

R

R

R/W

R/W

—

R/W

R/W

—

POR DEFAULT

11000000b

No Change

No Change

00h

00h

STATUS/CONFIG REGISTER

The Status/Config register is read/write with individual bits designated as read only. Bit values indicate status as

well as program or select device functionality.

Figure 10. STATUS/CONFIG REGISTER FORMAT

BIT 7

X

BIT 6

PORF

BIT 5

SMOD

ADDRESS 01

BIT 4

NBEN

BIT 3

PIO

BIT 2

A2

BIT 1

A1

BIT 0

A0

X — Reserved.

PORF — The Power-On-Reset Flag is set to indicate initial power-up. PORF is not cleared internally. The user

must write this flag value to a 0 in order to use it to indicate subsequent power-up events. If PORF indicates a

power-on-reset, the ACR could be misaligned with the actual battery state of charge. The system can request a

charge to full in order to synchronize the ACR with the battery charge state. PORF is read/write-to-zero.

SMOD — SLEEP Mode Enable. A value of 1 allows the DS2745 to enter sleep mode when both SDA and SCL

pins is low for 2s. A value of 0 disables the transition to sleep mode. The power-up default of SMOD = 0.

NBEN — Negative Blanking Enable. A value of 1 enables blanking of negative current values up to 25V. A value

of 0 disables blanking of negative currents. The power-up default of NBEN = 0.

PIO — Programmable Input/Output. PIO provides both control of the PIO open-drain output driver and readback of

the PIO pin logic level. Writing a 0 to PIO drives PIO pin low. Writing a 1 deactivates the PIO output and allows

readback of an external signal. Reading PIO returns the logic state on the pin. PIO is RESET on POR.

A2:A0 — I2C Slave Address bits. A2:A0 set the lower 3 bits of the I2C slave address. When modified from the

power-up default slave address of 1001000b, accessing the DS2745 requires the modified slave address following

a start or repeated start.

11 of 15

Share Link: