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ATA5279N-PLQW Datasheet(PDF) 9 Page - ATMEL Corporation |
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ATA5279N-PLQW Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 38 page  9 9125F–RKE–09/09 ATA5279N [Preliminary] Figure 3-3. Base Structure of the Diagnosis Module of One Output Channel The structure above can be found in each of the six channels of ATA5279N. As soon as the diagnosis mode is engaged, all channels are operated in this way. On the channel that is actu- ally selected, the setting of the switches can be changed with the Set Coil Current command and the status of the two connection lines can be checked with the Get Driver Setup command. The two switches in the P line driver are controlled with one bit. That means, either the high-side (S_HxP) or the low-side (S_LxP) switch is closed. The same is true for the N line driver (S_HxN, S_LxN). The controlling bits c 0 and c1 are taken from the coil current selection register (see Sec- tion 3.9.2 “General Command Description” on page 20 in this document). Note that the setting of the switches is latched. That means, if the setting on the switches of the selected driver is changed, the setting on the five other channels remains unchanged. By a combination of test structures, many different faults, even between the coils, can be detected. As described in the principle schematic of a driver stage above, a test structure consists of two switchable current sources (one to VDS and one to GND) and a comparator that converts the voltage level on the line into a digital signal. The switches for the current sources can only be controlled in diagnosis mode, with the corresponding coil being selected (see also Driver Com- mand description). Note that one switch is always closed, either the high-side or the low-side switch of one test structure. These structures are independent, i.e., they can be set up for each line individually and at the same time. The status of the connection lines of the selected coil can be read out with a SPI command. In the following example, there is a short circuit between the positive coil connections of coil 1 and 2. VDS AGND Driver x select Latch c0 bit c0, 1 bits c1 bit VDS AGND S_HxN c1 = '1' S_LxN c1 = '0' AxN AxP S_HxP c0 = '1' S_LxP c0 = '0' |
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