Datasheet

LTC4151
6
4151ff
For more information www.linear.com/LTC4151
pin FuncTions
ADIN: ADC Input. The onboard ADC measures voltage
range between 0V and 2.048V. Tie to GND if unused.
ADR1, ADR0: I
2
C Device Address Inputs. Connecting
ADR1 and ADR0 to V
IN
, GND or leaving the pins open
configures one of nine possible addresses. See Table 1
in the Applications Information section for details.
Exposed
Pad (DD Package Only): Exposed pad may be
left open or connected to device ground (GND).
GND: Device Ground.
SCL: I
2
C Bus Clock Input. Data is shifted in and out at
the SDA pin on rising edges of SCL. This pin is driven
by an open-collector output from a master controller. An
external pull-up resistor or current source is required and
can be placed between SCL and V
IN
. The voltage at SCL
is internally clamped to 6V (5.5V minimum).
SDA (LTC4151 Only): I
2
C Bus Data Input/Output. Used
for shifting in address, command or data bits and sending
out data. An external pull-up resistor or current source
is required and can be placed between SDA and V
IN
.
The voltage at SDA is internally clamped to 6V (5.5V
minimum).
SDAI
(LTC4151-1/LTC4151-2 Only): I
2
C Bus Data Input.
Used for shifting in address, command, data, and SDAO
acknowledge bits. This pin is driven by an open-collector
output from a master controller. An external pull-up resistor
or current source is required and can be placed between
SDAI and V
IN
. If the master separates SDAI and SDAO,
data read at SDAO needs to be echoed back to SDAI for
proper I
2
C communication. The voltage at SDAI is internally
clamped to 6V (5.5V minimum).
SDAO (LTC4151-2 Only): Serial Bus Data Output. Open-
drain output used for sending data back to the master
controller or acknowledging a write operation. Normally
tied to SDAI to form the SDA line. An external pull-up
resistor or current source is required.
SDAO (LTC4151-1 Only): Inverted Serial Bus Data Out
-
put. Open
-drain output used for sending data back to the
master
controller or acknowledging a write operation. Data
is inverted for convenience of opto-isolation. An external
pull-up resistor or current source is required.
SENSE
+
: Kelvin Sense of the V
IN
Pin. See Figure 10 for
recommended Kelvin connection.
SENSE
–
: High Side Current Sense Input. Connect an
external sense resistor between SENSE
+
and SENSE
–
.
The differential voltage between SENSE
+
and SENSE
–
is
monitored by the onboard ADC with a full-scale sense
voltage of 81.92mV.
Typical perForMance characTerisTics
V
IN
= 12V, T
A
= 25°C, unless noted.
SDA, SDAO, SDAO Output Low vs
Pull-Up Current (V
SDA(OL)
vs I
SDA
)
SDA, SDAI, SCL Clamp Voltage
vs Load Current
I
SDA
(mA)
0
V
SDA(OL)
(V)
0.3
0.4
20
0.2
0.1
0
5
10
15
0.5
4151 G09
– 40°C
25°C
85°C
I
LOAD
(mA)
0.01 0.1 1 10
6.2
6.1
6.0
5.9
6.3
4151 G10
V
SDA,SCL(CL)
(V)
– 40°C
85°C
25°C