ZHCSKY4B November 2018 – December 2020 TPS55288
PRODUCTION DATA
REF is shown in Figure 7-15 and Figure 7-16 described in Table 7-4.
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REF sets the internal reference voltage of the TPS55288. The 01h register is the high byte and the 00h register is the low byte. One LSB of register 00h stands for 1.129 mV of the internal reference voltage. The default register value is 00000000 11010010b of 282 mV. When the register value is 00000000 00000000b, the reference voltage is 45 mV. When the register value is 00000011 11000000b, the reference voltage is 1.129 V. The output voltage of the TPS55288 also depends on the output feedback ratio, which is either set in register 04h or set by an external resistor divider.
Writing register 01h enables the TPS55288 to load the 01h and 00h data into the internal 10-bit DAC. Writing the register 00h does not impact the internal reference voltage.| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| VREF | |||||||
| R/W-11010010b | |||||||
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| Reserved | VREF | ||||||
| R/W-000000b | R/W-00b | ||||||
| Bit | Field | Type | Reset | Description |
|---|---|---|---|---|
| 15-10 | Reserved | R/W | 000000b | Reserved |
| 9-0 | VREF | R/W | 00 11010010b | Sets the internal reference
voltage 00 00000000b = 45-mV reference voltage 00 00000001b = 46.129-mV reference voltage 00 00000010b = 47.258-mV reference voltage ...... = ...... 00 11010010b = 282-mV reference voltage (Default) ...... = ...... 01 10011010b = 508-mV reference voltage ...... = ...... 10 11000110b = 846-mV reference voltage ...... = ...... 11 11000000b = 1129-mV reference voltage ...... = ...... 11 11111111b = 1200-mV reference voltage |