DS2745U+ Maxim Integrated Products, DS2745U+ Datasheet - Page 11

• Manufacturer Part Number: DS2745U+
• Description: IC BATT MONITOR I2C 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of DS2745U+

• Function: Fuel, Gas Gauge/Monitor
• Battery Type: Lithium-Ion (Li-Ion); Nickel-Metal Hydride (NiMH)
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Product: Fuel Gauges
• Operating Supply Voltage: 2.5 V to 5.5 V
• Supply Current: 70 uA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Charge Safety Timers: No
• Mounting Style: SMD/SMT
• Temperature Monitoring: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 5. MEMORY MAP
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
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 — I
power-up default slave address of 1001000b, accessing the DS2745 requires the modified slave address following
a start or repeated start.
ADDRESS (HEX)
09 to 0D
63 to FF
02 to 08
12 to 61
0A
0B
0C
0D
0E
2
00
01
0F
10
11
61
62
C Slave Address bits. A2:A0 set the lower 3 bits of the I
BIT 7
X
Reserved
Status/Config Register
Reserved
Reserved
Temperature Register MSB
Temperature Register LSB
Voltage Register MSB
Voltage Register LSB
Current Register MSB
Current Register LSB
Accumulated Current Register MSB
Accumulated Current Register LSB
Reserved
Offset Bias Register
Accumulation Bias Register
Reserved
PORF
BIT 6
SMOD
BIT 5
DESCRIPTION
NBEN
BIT 4
ADDRESS 01
11 of 15
BIT 3
PIO
BIT 2
2
C slave address. When modified from the
A2
READ/WRITE
DS2745 Low-Cost I
R/W
R/W
R/W
R/W
R/W
—
—
—
—
—
BIT 1
R
R
R
R
R
R
A1
BIT 0
A0
POR DEFAULT
2
C Battery Monitor
11000000b
No Change
No Change
00h
00h