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MCP9803 Datenblatt(PDF) 9 Page - Microchip Technology |
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MCP9803 Datenblatt(HTML) 9 Page - Microchip Technology |
9 / 30 page 2010 Microchip Technology Inc. DS21909C-page 9 MCP9800/1/2/3 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 Serial Data Pin (SDA) The SDA is a bidirectional input/output pin, used to serially transmit data to and from the host controller. This pin requires a pull-up resistor to output data. 3.2 Serial Clock Pin (SCLK) The SCLK is a clock input pin. All communication and timing is relative to the signal on this pin. The clock is generated by the host controller on the bus. 3.3 Power Supply Input (VDD) The VDD pin is the power pin. The operating voltage, as specified in the DC electrical specification table, is applied on this pin. 3.4 Ground (GND) The GND pin is the system ground pin. 3.5 ALERT Output The MCP9800/1/2/3’s ALERT pin is an open-drain output pin. The device outputs an alert signal when the ambient temperature goes beyond the user-programmed temperature limit. 3.6 Address Pins (A2, A1, A0) These pins are device or slave address input pins and are available only with the MCP9801/03. The device addresses for the MCP9800/02 are factory-set. The address pins are the Least Significant bits (LSb) of the device address bits. The Most Significant bits (MSb) (A6, A5, A4, A3) are factory-set to <1001>. This is illustrated in Table 3-2. MCP9800 MCP9802 SOT-23-5 MCP9801 MCP9803 MSOP, SOIC Symbol Function 5 1 SDA Bidirectional Serial Data 4 2 SCLK Serial Clock Input 3 3 ALERT Temperature Alert Output 2 4 GND Ground — 5 A2 Address Select Pin (bit 2) — 6 A1 Address Select Pin (bit 1) — 7 A0 Address Select Pin (bit 0) 18 VDD Power Supply Input TABLE 3-2: SLAVE ADDRESS Device A6 A5 A4 A3 A2 A1 A0 MCP9800/02A0 10010 00 MCP9800/02A5 10011 01 MCP9801/03 1001X XX Note: User-selectable address is shown by X. |
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