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PCA9848PW Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA9848PW Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 32 page  PCA9848 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 1 — 15 December 2014 7 of 32 NXP Semiconductors PCA9848 8-channel ultra-low voltage, Fm+ I2C-bus switch with reset 6.2.1 Software Reset The Software Reset Call allows all the devices in the I2C-bus to be reset to the power-up state value through a specific formatted I2C-bus command. To be performed correctly, it implies that the I2C-bus is functional and that there is no device hanging the bus. The Software Reset sequence is defined as following: 1. A START command is sent by the I2C-bus master. 2. The reserved General Call I2C-bus address ‘0000 000’ with the R/W bit set to 0 (write) is sent by the I2C-bus master. 3. The device acknowledges after seeing the General Call address ‘0000 0000’ (00h) only. If the R/W bit is set to 1 (read), no acknowledge is returned to the I2C-bus master. 4. Once the General Call address has been sent and acknowledged, the master sends 1 byte. The value of the byte must be equal to 06h. a. The device acknowledges this value only. If the byte is not equal to 06h, the device does not acknowledge it. If more than 1 byte of data is sent, the device does not acknowledge any more. 5. Once the right byte has been sent and correctly acknowledged, the master sends a STOP command to end the Software Reset sequence: the device then resets to the default value (power-up value) and is ready to be addressed again within the specified bus free time. If the master sends a Repeated START instead, no reset is performed. The I2C-bus master must interpret a non-acknowledge from the device (at any time) as a ‘Software Reset Abort’. The device does not initiate a reset of its registers. The unique sequence that initiates a Software Reset is described in Figure 7. Fig 7. Software Reset sequence aaa-011779 0 0 0 0 0 0 0 A S 0 SWRST Call I2C-bus address START condition R/W acknowledge from slave(s) 0 0 0 0 1 1 0 0 SWRST data = 06h A acknowledge from slave(s) P PCA9848 is reset. Registers are set to default power-up values. |
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