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MCP4142T-104E/MS 数据表(PDF) 29 Page - Microchip Technology |
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MCP4142T-104E/MS 数据表(HTML) 29 Page - Microchip Technology |
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29 / 88 page  © 2008 Microchip Technology Inc. DS22059B-page 29 MCP414X/416X/424X/426X 4.0 FUNCTIONAL OVERVIEW This Data Sheet covers a family of thirty-two Digital Potentiometer and Rheostat devices that will be referred to as MCP4XXX. The MCP4XX1 devices are the Potentiometer configuration, while the MCP4XX2 devices are the Rheostat configuration. As the Device Block Diagram shows, there are four main functional blocks. These are: • POR/BOR Operation • Memory Map • Resistor Network • Serial Interface (SPI) The POR/BOR operation and the Memory Map are discussed in this section and the Resistor Network and SPI operation are described in their own sections. The Device Commands commands are discussed in Section 7.0 . 4.1 POR/BOR Operation The Power-on Reset is the case where the device is having power applied to it from VSS. The Brown-out Reset occurs when a device had power applied to it, and that power (voltage) drops below the specified range. The devices RAM retention voltage (VRAM) is lower than the POR/BOR voltage trip point (VPOR/VBOR). The maximum VPOR/VBOR voltage is less then 1.8V. When VPOR/VBOR < VDD < 2.7V, the electrical performance may not meet the data sheet specifications. In this region, the device is capable of reading and writing to its EEPROM and incrementing, decrementing, reading and writing to its volatile memory if the proper serial command is executed. 4.1.1 POWER-ON RESET When the device powers up, the device VDD will cross the VPOR/VBOR voltage. Once the VDD voltage crosses the VPOR/VBOR voltage the following happens: • Volatile wiper register is loaded with value in the corresponding non-volatile wiper register • The TCON register is loaded it’s default value • The device is capable of digital operation 4.1.2 BROWN-OUT RESET When the device powers down, the device VDD will cross the VPOR/VBOR voltage. Once the VDD voltage decreases below the VPOR/VBOR voltage the following happens: • Serial Interface is disabled • EEPROM Writes are disabled If the VDD voltage decreases below the VRAM voltage the following happens: • Volatile wiper registers may become corrupted • TCON register may become corrupted As the voltage recovers above the VPOR/VBOR voltage see Section 4.1.1 “Power-on Reset”. Serial commands not completed due to a brown-out condition may cause the memory location (volatile and non-volatile) to become corrupted. 4.2 Memory Map The device memory is 16 locations that are 9-bits wide (16x9 bits). This memory space contains both volatile and non-volatile locations (see Table 4-1). TABLE 4-1: MEMORY MAP Address Function Memory Type 00h Volatile Wiper 0 RAM 01h Volatile Wiper 1 RAM 02h Non-Volatile Wiper 0 EEPROM 03h Non-Volatile Wiper 1 EEPROM 04h Volatile TCON Register RAM 05h Status Register RAM 06h Data EEPROM EEPROM 07h Data EEPROM EEPROM 08h Data EEPROM EEPROM 09h Data EEPROM EEPROM 0Ah Data EEPROM EEPROM 0Bh Data EEPROM EEPROM 0Ch Data EEPROM EEPROM 0Dh Data EEPROM EEPROM 0Eh Data EEPROM EEPROM 0Fh Data EEPROM EEPROM |
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