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BU21025GUL Scheda tecnica(PDF) 8 Page - Rohm |
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BU21025GUL Scheda tecnica(HTML) 8 Page - Rohm |
8 / 19 page BU21025GUL TSZ02201-0Y2Y0F300050-1-2 © 2012 ROHM Co., Ltd. All rights reserved. 7.AUG.2012 Rev.002 www.rohm.com TSZ22111・15・001 8/15 Datasheet Datasheet Read Protocol A data read is started in BU21025GUL when the master sends the start condition, the slave address of BU21025GUL, and one in bit 0( 8 th bit) for reading, as shown in Table 1. If the slave address is matched with its own, BU21025GUL issues an acknowledge to the master. Next, BU21025GUL send upper 8-bit (D11-4) of an A/D converted 12-bit data as data byte 1 and wait an acknowledge from the master. After receiving the acknowledge, the data byte 2 is sent. Upper 4 bits of it are lower 4 bits (D3-0) of the A/D converted 12-bit data, and lower 4 bits of it are all zero. In next acknowledge timing, the master send a not-acknowledge and the stop or repeated start condition for ending read. In the last acknowledge timing, BU21025GUL doesn’t check the acknowledge and stop sending data. So if the master send an acknowledge and continue reading a byte, the read data become 0xFF. In the 8-bit mode, all of an A/D converted 8-bit data is in the data byte 1. So, the master doesn’t need to read the data byte 2. Figure 2. Read Protocol If an A/D conversion is not finished until falling edge SCL after first acknowledge timing with read mode, SCL pin is stretched by BU21025GUL.In this state, SCL pin is forced to low by BU21025GUL and SDA value is invalid data. This state is ended when the A/D conversion is finished. After this state end, the master can control the SCL line and read converted data. With stretch function, the master can access immediately after sending a conversion command. If performance of an A/D conversion is needed, the master send the read command after the A/D conversion is finished. Detail of a A/D conversion time is shown in Table 6. Figure 3. Read with Stretch |
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