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DS2745U+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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DS2745U+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page DS2745 Low-Cost I 2C Battery Monitor 11 of 14 Table 5. MEMORY MAP ADDRESS (HEX) DESCRIPTION READ/WRITE POR DEFAULT 00 Reserved — 01 Status/Config Register R/W 11000000b 02 to 08 Reserved — 09 to 0D Reserved — 0A Temperature Register MSB R 0B Temperature Register LSB R 0C Voltage Register MSB R 0D Voltage Register LSB R 0E Current Register MSB R 0F Current Register LSB R 10 Accumulated Current Register MSB R/W No Change 11 Accumulated Current Register LSB R/W No Change 12 to 61 Reserved — 61 Offset Bias Register R/W 00h 62 Accumulation Bias Register R/W 00h 63 to FF Reserved — STATUS/CONFIG REGISTER The Status/Config register is read/write with individual bits designated as read only. Bit values indicate status as well as program or select device functionality. Figure 10. STATUS/CONFIG REGISTER FORMAT ADDRESS 01 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 X PORF SMOD NBEN PIO A2 A1 A0 X — Reserved. PORF — The Power-On-Reset Flag is set to indicate initial power-up. PORF is not cleared internally. The user must write this flag value to a 0 in order to use it to indicate subsequent power-up events. If PORF indicates a power-on-reset, the ACR could be misaligned with the actual battery state of charge. The system can request a charge to full in order to synchronize the ACR with the battery charge state. PORF is read/write-to-zero. SMOD — SLEEP Mode Enable. A value of 1 allows the DS2745 to enter sleep mode when both SDA and SCL pins is low for 2s. A value of 0 disables the transition to sleep mode. The power-up default of SMOD = 0. NBEN — Negative Blanking Enable. A value of 1 enables blanking of negative current values up to 25 mV. A value of 0 disables blanking of negative currents. The power-up default of NBEN = 0. PIO — Programmable Input/Output. PIO provides both control of the PIO open-drain output driver and readback of the PIO pin logic level. Writing a 0 to PIO drives PIO pin low. Writing a 1 deactivates the PIO output and allows readback of an external signal. Reading PIO returns the logic state on the pin. PIO is RESET on POR. A2:A0 — I 2C Slave Address bits. A2:A0 set the lower 3 bits of the I2C slave address. When modified from the power-up default slave address of 1001000b, accessing the DS2745 requires the modified slave address following a start or repeated start. |
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