ds1878 Maxim Integrated Products, Inc., ds1878 Datasheet - Page 82

• Manufacturer Part Number: ds1878
• Description: Sfp+ Controller With Digital Ldd Interface
• Manufacturer: Maxim Integrated Products, Inc.

SFP+ Controller with Digital LDD Interface
Table 02h, Register CFh: DEVICE VER
Table 02h, Register D0h–D7h: HBATH
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D0h–D7h
CFh
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
Hardwired connections to show the device version.
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
High-Bias Alarm Threshold (HBATH) is a digital clamp used to ensure that the DAC setting for BIAS currents does
not exceed a set value. The table below shows the range of temperature for each byte’s location. The table shows a
rising temperature; for a falling temperature there is 1°C of hysteresis.
BIT 7
BIT 7
D0h
D1h
D2h
D3h
D4h
D5h
D6h
D7h
2
7
Less than or equal to -8°C
Greater than -8°C up to +8°C
Greater than +8°C up to +24°C
Greater than +24°C up to +40°C
Greater than +40°C up to +56°C
Greater than +56°C up to +72°C
Greater than +72°C up to +88°C
Greater than +88°C
2
6
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (SEE)
DEVICE VERSION
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
N/A
ROM
2
5
DEVICE VERSION
2
4
2
3
2
2
2
1
BIT 0
BIT 0
2
0