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AD7992 Fiches technique(PDF) 18 Page - Analog Devices |
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AD7992 Fiches technique(HTML) 18 Page - Analog Devices |
18 / 21 page AD7992 –18– REV. PrH PRELIMINARYTECHNICAL DATA Figure 14. Reading two bytes of data from the Conversion Result Register Figure 13. Reading a single byte of data from a selected register SMBus ALERT to signal the host device that it wants to talk. The SMBus ALERT on the AD7992 is used as an out of conversion range indicator. The ALERT pin has an open-drain configuration which allows the ALERT outputs of several AD7992 devices to be wired-AND together when the ALERT pin is active low. D0 of the Configuration Register is used to set the active polarity of the ALERT output. The power-up de- fault is active low. The ALERT function can be disabled or enabled by setting D2 of the Configuration Register to 1 or 0 respectively. The host device can process the ALERT interrupt and simultaneously access all SMBus ALERT devices through the alert response address. Only the device which pulled the ALERT low will acknowledge the ARA (Alert Re- sponse Address). If more than one device pulls the ALERT pin low, the highest priority (lowest address) device will win communication rights via standard I2C arbitration during the slave address transfer. The ALERT output becomes active when the value in the Conversion Result Register exceeds the value in the DATAHIGH Register or falls below the value in the DATALOW Register . It is reset when a write operation to the Configuration register sets D1 to a 1, or when the conversion result returns N LSBs below or above the value stored in the DATAHIGH Register or DATALOW Register respectively. N is the value in the Hysteresis register. (See Limit Registers section) The ALERT output requires an external pull-up resistor. This can be connected to a voltage different from VDD provided the maximum voltage rating of the ALERT out- put pin is not exceeded. The value of the pull-up resistor depends on the application, but should be as large as pos- sible to avoid excessive sink currents at the ALERT out- put. SDA NO ACK. BY MASTER START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 SINGLE DATA BYTE FROM AD7992 ACK. BY AD7992 19 1 9 D7 D6 D5 D2 D1 D0 R/ 9 A0 A1 A2 A3 0 1 SCL STOP BY MASTER D4 D3 0 SDA ACK. BY MASTER START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 MOST SIGNIFICANT DATA BYTE FROM AD7992 ACK. BY AD7992 19 1 9 Alert_ Flag D10 D9 D8 R/ 9 A0 A1 A2 A3 0 0 SCL 1 D11 NO ACK. BY MASTER FRAME 3 LEAST SIGNIFICANT DATA BYTE FROM AD7992 19 D7 D6 D5 D2 D1 D0 STOP BY MASTER D4 D3 SCL (CONTINUED) SDA (CONTINUED) CH ID0 00 |
Numéro de pièce similaire - AD7992 |
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Description similaire - AD7992 |
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