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MCP47CMB02 Datasheet(PDF) 48 Page - Microchip Technology |
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MCP47CMB02 Datasheet(HTML) 48 Page - Microchip Technology |
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48 / 124 page  MCP47CXBXX DS20006089B-page 48 2018-2019 Microchip Technology Inc. Volatile memory determines the Analog Output (VOUT) pin voltage. After the device is powered up, the user can update the device memory. When the rising VDD voltage crosses the VPOR trip point, the following occur: • The default DAC POR value is latched into the Volatile DAC register. • The default DAC POR Configuration bit values are latched into the Volatile Configuration bits. • POR status bit is set (‘1’). • The Reset Delay Timer (tPORD) starts; when the Reset Delay Timer (tPORD) times out, the I2C serial interface is operational. During this delay time, the I2C interface will not accept commands. • The Device Memory Address Pointer is forced to 00h. The Analog Output (VOUT) state is determined by the state of the Volatile Configuration bits and the DAC register. This is called a Power-on Reset (event). Figure 4-1 illustrates the conditions for power-up and power-down events under typical conditions. FIGURE 4-1: Power-on Reset Operation. VPOR TPORD2OD VDD(MIN) BOR Reset, Volatile DAC Register = 000h Volatile VRxB:VRxA = 00 VRAM Volatile Gx = 0 Volatile PDxB:PDxA = 11 VBOR POR starts Reset Delay Timer. When timer times out, the I2C interface can operate (if VDD VDD(MIN)). VDD(MIN) TPOR2OD VBOR VPOR VRAM Case 1: VDD Ramp Case 2: VDD Step Volatile Memory Retains Data Value POR Reset Force Active Device in Unknown Device in POR State Normal Operation State Below Min. Operating Voltage Device in Power- Down State Device in Unknown State Default device configuration latched into Volatile Configuration bits and DAC register. POR status bit is set (‘1’). Volatile Memory becomes Corrupted Volatile Memory becomes Corrupted Device in Power- Down State Device in Unknown State Normal Operation Below Min. Operating Voltage Device in Unknown State Device in Known State Volatile Memory Retains Data Value POR Event |
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