Specifications

Reference Design HFRD-25.2 (Rev.8; 01/09) Maxim Integrated Products
Page 23 of 42
0Eh SupplyO: Supply voltage offset for V
CC
calibration routine. See Section 10.6 for additional details.
0Fh Unused memory location.
10h
to
33h
Instant-On Lookup Table values. Each location holds the initial bias current value for a given
temperature from -40
o
C to +100
o
C, where address 10h corresponds to -40
o
C and 33h corresponds to
+100
o
C
34h
to
7Fh
Vendor EEPROM for module identification, etc.
Table 3: SRAM Memory (60h to E0h)
Byte Name/Definition
60h SRAM_OFFSET: Memory control byte. If bit 0 of this byte is set, the two-wire interface can read or
write any of the SRAM memory locations using an offset (128bytes addressed from 00h to 7Fh). If
bit 0 of byte 0 (bit 0 of byte 60h with no offset applied) is cleared, then the two-wire interface can
read the internal registers (96bytes addressed from 00h to 5fh). On power-on bit 0 is set by the
microcontroller firmware. If this bit is cleared by the two-wire interface, it must be reset by writing 1h
to address 60h to resume normal operation. This feature was included to enhance debug capabilities
when writing the firmware for the microcontroller.
61h
to
6Dh
Program accessed SRAM
6Eh TemperVH: High byte of temperature analog-to-digital conversion result.
6Fh TemperVL: Low byte of temperature analog-to-digital conversion result.
70h SupplyVH: High byte of supply voltage analog-to-digital conversion result (calibrated).
71h SupplyVL: Low byte of supply voltage analog-to-digital conversion result (calibrated).
72h IBiasVH: High byte of temperature analog-to-digital conversion result.
73h IBiasVL: Low byte of temperature analog-to-digital conversion result.
74h Imd1V: Monitor diode current analog-to-digital conversion result.
75h RSSIVH: High byte of RSSI analog-to-digital conversion result.
76h RSSIVL: Low byte of RSSI analog-to-digital conversion result.
77h CalTemp: Calibrated temperature result, where 00h = -40
o
C, 01h = -39
o
C, 02h = -38
o
C, … 8Bh =
+99
o
C, 8Ch = +100
o
C.
78h TIndex: Instant-On lookup table index value.
79h
to
7Eh
Program accessed SRAM