EVALST7590-1 Datasheet, PDF (16/24 Pages) STMicroelectronics – Narrow-band OFDM power line networking PRIME compliant system-on-chip

Analog front end (AFE)
ST7590
4.5
Zero-crossing detector
The ST7590 embeds an analog comparator with hysteresis, used for zero-crossing
detection. Information about zero crossing events is managed as specified in PRIME
protocol specifications.
4.6
One time programmable (OTP) memory array
ST7590 comes with an embedded 64 bit OTP array. This OTP memory is used to store
hardware trimming values and the unique identifier EUI48, used for unique addressing in
PRIME MAC protocol.
OTP array is composed of 4 16 bit words, indexed from 0 to 3, where the first (index 0)
contains hardware trimming values, while the others contain the EUI48 address as specified
in Table 7.
Table 7. OTP memory array
Index
LSB
MSB
0
Reserved – hardware trimming
1
EUI48[0..7]
EUI48[8..15]
2
EUI48[16..23]
EUI48[24..31]
3
EUI48[32..39]
EUI48[40..47]
4.7
Note:
Power management
Figure 7 shows the power supply structure for the ST7590. The ST7590 operates from two
external supply voltages:
● VCC (8 to 18 V) as the main power supply;
● VDDIO (3.3 or 5 V) for the I/O and digital sections.
Two internal linear regulators provide the remaining required voltages:
● 5 V regulator (used by the analog front end blocks), generated from the VCC voltage
and connected to the VCCA pin;
● 1.8 V regulator (required for the DSP and microcontroller cores, the digital blocks, the
PLL and the oscillator), generated from the VDDIO voltage and connected to the
VDD_REG_1V8 pin.
All the supply voltages must be properly filtered, to their respective ground, using external
capacitors close to each supply pin (see Figure 7).
The internal regulators connected to VDD_REG_1V8 and VCCA are not designed to supply
external circuitry; their output is externally accessible for filtering purpose only.
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Doc ID 18349 Rev 1