Pin Functions; Block Diagram - Analog Devices LTC2941 Datasheet

LTC2941

PIN FUNCTIONS

+
SENSE (Pin 1): Positive Current Sense Input and Power
Supply. Connect to the load/charger side of the sense
resistor. V operating range is 2.7V to 5.5V.
SENSE +
GND (Pin 2): Device Ground. Connect directly to the nega-
tive battery terminal.
SCL (Pin 3): Serial Bus Clock Input.
SDA (Pin 4/Pin 6): Serial Bus Data Input and Output.
AL/CC (Pin 5/Pin 7): Alert Output or Charge Complete
Input. Configured either as an SMBus alert output or
charge complete input by control register bits B[2:1].
At power-up, the pin defaults to alert mode conforming
to the SMBus alert response protocol. It behaves as an

BLOCK DIAGRAM

+
SENSE
–
SENSE
GND
6
V
SUPPLY
BIDIRECTIONAL
INTEGRATOR
REF CLK
INTERNAL
INTERNAL
REFERENCE
OSCILLATOR
GENERATOR
Figure 2. Block Diagram of the LTC2941
For more information
open-drain logic output that pulls to GND when a value
in the threshold registers is exceeded.
When configured as a charge complete input, connect to
the charge complete output from the battery charger cir-
cuit. A high level at CC sets the value of the accumulated
charge (registers C, D) to FFFFh.
–
SENSE (Pin 6/Pin 8): Negative Current Sense Input.
–
Connect SENSE to the positive battery terminal side
of the sense resistor. The voltage between SENSE
+
SENSE must remain within ±50mV in normal operation.
Exposed Pad (Pin 7/Pin 9): Do not connect.
CC
ACCUMULATED
PRESCALER
CHARGE
M
REGISTER
STATUS/
CONTROL
REGISTER
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AL AL/CC
SCL
2
I C/
SMBus
SDA
2941 F02
–
and
Rev. C