Datasheet LTC4305 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | 2-Channel, 2-Wire Bus Multiplexer with Capacitance Buffering |
| 页数 / 页 | 20 / 6 — PI FU CTIO S. ALERT1–ALERT2 (Pins 14, 1):. VCC (Pin 7):. ADR0–ADR2 (Pins … |
| 文件格式/大小 | PDF / 256 Kb |
| 文件语言 | 英语 |
PI FU CTIO S. ALERT1–ALERT2 (Pins 14, 1):. VCC (Pin 7):. ADR0–ADR2 (Pins 8–10):. ALERT (Pin 2):. READY (Pin 11):
该数据表的模型线
文件文字版本
LTC4305
U U U PI FU CTIO S ALERT1–ALERT2 (Pins 14, 1):
Fault Alert Inputs,
VCC (Pin 7):
Power Supply Voltage. Connect a bypass Channels 1–2. Devices on each of the two output channels capacitor of at least 0.01µF directly between VCC and GND can pull their respective pin low to indicate that a fault has for best results. occurred. The LTC4305 then pulls the ALERT low to pass
ADR0–ADR2 (Pins 8–10):
Three-State Serial Bus the fault indication on to the host. See the “Operation” Address Inputs. Each pin may be floated, tied to ground, section below for the details of how ALERT is set and or tied to V cleared. Connect unused fault alert inputs to V CC. There are therefore 27 possible addresses. CC. See Table 1 in Applications Information section. When the
ALERT (Pin 2):
Fault Alert Output. An open-drain output pins are floated, they can tolerate ±5µA of leakage current that is pulled low when a fault occurs to alert the host and still convert the address correctly. controller. The LTC4305 pulls ALERT low when any of the
READY (Pin 11):
Connection Ready Digital Output. An ALERT1–ALERT2 pins is low; when the two-wire bus is N-channel MOSFET open-drain output transistor that pulls stuck low; or when the Connection Requirement bit of down when none of the downstream channels is con- register 2 is low and a master tries to connect to a nected to the upstream bus and turns off when one or downstream channel that is low. See the “Operation” more downstream channels is connected to the upstream section below for the details of how ALERT is set and bus. Connect a 10k resistor to a power supply voltage to cleared. The LTC4305 is compatible with the SMBus Alert provide the pull-up. Tie to ground if unused. Response Address protocol. Connect a 10k resistor to a power supply voltage to provide the pull-up. Tie to ground
SCL1–SCL2 (Pins 12, 16):
Serial Bus Clock Outputs if unused. Channels 1–2. Connect pins SCL1–SCL2 to the SCL lines on the downstream channels 1–2, respectively. It is ac-
SDAIN (Pin 3):
Serial Bus Data Input and Output. Connect ceptable to float any pin that will never be connected to the this pin to the SDA line on the master side. An external upstream bus. Otherwise, an external pull-up resistor or pull-up resistor or current source is required. current source is required on each pin.
GND (Pin 4):
Device Ground.
SDA1–SDA2 (Pins 13, 15):
Serial Bus Data Output
SCLIN (Pin 5):
Serial Bus Clock Input. Connect this pin to Channels 1–2. Connect pins SDA1–SDA2 to the SDA lines on the SCL line on the master side. An external pull-up downstream channels 1–2, respectively. It is acceptable resistor or current source is required. to float any pin that will never be connected to the upstream bus. Otherwise, an external pull-up resistor or
ENABLE (Pin 6):
Digital Interface Enable and Register current source is required on each pin. Reset. Driving ENABLE high enables I2C communication to the LTC4305. Driving ENABLE low disables I2C com-
Exposed Pad (Pin 17, DHD Package Only):
Exposed pad munication to the LTC4305 and resets the registers to may be left open or connected to device ground. their default state as shown in the Operations section. When ENABLE returns high, masters can read and write the LTC4305 again. If unused, tie ENABLE to VCC. 4305f 6
U U U PI FU CTIO S ALERT1–ALERT2 (Pins 14, 1):
Fault Alert Inputs,
VCC (Pin 7):
Power Supply Voltage. Connect a bypass Channels 1–2. Devices on each of the two output channels capacitor of at least 0.01µF directly between VCC and GND can pull their respective pin low to indicate that a fault has for best results. occurred. The LTC4305 then pulls the ALERT low to pass
ADR0–ADR2 (Pins 8–10):
Three-State Serial Bus the fault indication on to the host. See the “Operation” Address Inputs. Each pin may be floated, tied to ground, section below for the details of how ALERT is set and or tied to V cleared. Connect unused fault alert inputs to V CC. There are therefore 27 possible addresses. CC. See Table 1 in Applications Information section. When the
ALERT (Pin 2):
Fault Alert Output. An open-drain output pins are floated, they can tolerate ±5µA of leakage current that is pulled low when a fault occurs to alert the host and still convert the address correctly. controller. The LTC4305 pulls ALERT low when any of the
READY (Pin 11):
Connection Ready Digital Output. An ALERT1–ALERT2 pins is low; when the two-wire bus is N-channel MOSFET open-drain output transistor that pulls stuck low; or when the Connection Requirement bit of down when none of the downstream channels is con- register 2 is low and a master tries to connect to a nected to the upstream bus and turns off when one or downstream channel that is low. See the “Operation” more downstream channels is connected to the upstream section below for the details of how ALERT is set and bus. Connect a 10k resistor to a power supply voltage to cleared. The LTC4305 is compatible with the SMBus Alert provide the pull-up. Tie to ground if unused. Response Address protocol. Connect a 10k resistor to a power supply voltage to provide the pull-up. Tie to ground
SCL1–SCL2 (Pins 12, 16):
Serial Bus Clock Outputs if unused. Channels 1–2. Connect pins SCL1–SCL2 to the SCL lines on the downstream channels 1–2, respectively. It is ac-
SDAIN (Pin 3):
Serial Bus Data Input and Output. Connect ceptable to float any pin that will never be connected to the this pin to the SDA line on the master side. An external upstream bus. Otherwise, an external pull-up resistor or pull-up resistor or current source is required. current source is required on each pin.
GND (Pin 4):
Device Ground.
SDA1–SDA2 (Pins 13, 15):
Serial Bus Data Output
SCLIN (Pin 5):
Serial Bus Clock Input. Connect this pin to Channels 1–2. Connect pins SDA1–SDA2 to the SDA lines on the SCL line on the master side. An external pull-up downstream channels 1–2, respectively. It is acceptable resistor or current source is required. to float any pin that will never be connected to the upstream bus. Otherwise, an external pull-up resistor or
ENABLE (Pin 6):
Digital Interface Enable and Register current source is required on each pin. Reset. Driving ENABLE high enables I2C communication to the LTC4305. Driving ENABLE low disables I2C com-
Exposed Pad (Pin 17, DHD Package Only):
Exposed pad munication to the LTC4305 and resets the registers to may be left open or connected to device ground. their default state as shown in the Operations section. When ENABLE returns high, masters can read and write the LTC4305 again. If unused, tie ENABLE to VCC. 4305f 6