LTM2883 Datasheet, PDF (13/36 Pages) Linear Technology – SPI/Digital or I2C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power

LTM2883
Pin Functions (LTM2883-S)
Logic Side
SDO (A1): Serial SPI Digital Output, Referenced to V_L
and GND. Logic output connected to isolated side SDO2
pin through isolation barrier. Under the condition of an
isolation communication failure this output is in a high
impedance state.
DO2 (A2): Digital Output, Referenced to V_L and GND. Logic
output connected to I2 through isolation barrier. Under
the condition of an isolation communication failure this
output is in a high impedance state.
SCK (A3): Serial SPI Clock Input, Referenced to V_L and
GND. Logic input connected to isolated side SCK2 pin
through isolation barrier. Do not float.
SDI (A4): Serial SPI Data Input, Referenced to V_L and GND.
Logic input connected to isolated side SDI2 pin through
isolation barrier. Do not float.
CS (A5): Serial SPI Chip Select, Referenced to V_L and GND.
Logic input connected to isolated side CS2 pin through
isolation barrier. Do not float.
SDOE (A6): Serial SPI Data Output Enable, Referenced to
V_L and GND. A logic high on SDOE places the logic side
SDO pin in a high impedance state, a logic low enables
the output. Do not float.
ON (A7): Enable. Enables power and data communica-
tion through the isolation barrier. If ON is high the part is
enabled and power and communications are functional
to the isolated side. If ON is low the logic side is held in
reset, all digital outputs are in a high impedance state, and
the isolated side is unpowered. Do not float.
V_L (A8): Logic Supply. Interface supply voltage for pins
SDI, SCK, SDO, DO1, DO2, CS, and ON. Operating voltage
is 1.62V to 5.5V. Internally bypassed with 2.2µF.
DO1 (B1): Digital Output, Referenced to V_L and GND. Logic
output connected to I1 through isolation barrier. Under
the condition of an isolation communication failure this
output is in a high impedance state.
GND (B2 to B6): Circuit Ground.
V_CC (B7 to B8): Supply Voltage. Operating voltage is 3V
to 3.6V for LTM2883-3 and 4.5V to 5.5V for LTM2883-5.
Internally bypassed with 2.2µF.
Isolated Side
SDO2 (L1): Serial SPI Digital Input, Referenced to V_CC2
and GND2. Logic input connected to logic side SDO pin
through isolation barrier. Do not float.
I2 (L2): Digital Input, Referenced to V_CC2 and GND2.
Logic input connected to DO2 through isolation barrier.
The logic state on I2 translates to the same logic state on
DO2. Do not float.
SCK2 (L3): Serial SPI Clock Output, Referenced to V_CC2
and GND2. Logic output connected to logic side SCK pin
through isolation barrier. Under the condition of an isolation
communication failure this output defaults to a low state.
SDI2 (L4): Serial SPI Data Output, Referenced to V_CC2
and GND2. Logic output connected to logic side SDI pin
through isolation barrier. Under the condition of an isolation
communication failure this output defaults to a low state.
CS2 (L5): Serial SPI Chip Select, Referenced to V_CC2 and
GND2. Logic output connected to logic side CS pin through
isolation barrier. Under the condition of an isolation com-
munication failure this output defaults to a high state.
V_CC2 (L6): 5V Nominal Isolated Supply Voltage. Internally
generated from V_CC by an isolated DC/DC converter and
regulated to 5V. Internally bypassed with 2.2µF.
V^– (L7): –12.5V Nominal Isolated Supply Voltage. Internally
generated from V_CC by an isolated DC/DC converter and
regulated to –12.5V. Internally bypassed with 1µF.
V⁺ (L8): 12.5V Nominal Isolated Supply Voltage. Internally
generated from V_CC by an isolated DC/DC converter and
regulated to 12.5V. Internally bypassed with 1µF.
I1 (K1): Digital Input, Referenced to V_CC2 and GND2.
Logic input connected to DO1 through isolation barrier.
The logic state on I1 translates to the same logic state on
DO1. Do not float.
GND2 (K2 to K5): Isolated Ground.
AV_CC2 (K6): 5V Nominal Isolated Supply Voltage Adjust.
The adjust pin voltage is 600mV Referenced to GND2.
AV^– (K7): –12.5V Nominal Isolated Supply Voltage Adjust.
The adjust pin voltage is –1.22V Referenced to GND2.
AV⁺ (K8): 12.5V Nominal Isolated Supply Voltage Adjust.
The adjust pin voltage is 1.22V Referenced to GND2.
2883f
13