170 CTW-SPMS — Programmable Smart Power Management & Supervisor
170 : CTW-SPMS — Programmable Smart Power Management & Supervisor
- Author: rakuichijo2001-sketch
- Description: Programmable all-digital smart power-management and supervision ASIC
- GitHub repository
- Open in 3D viewer
- Open in Tiny Tapeout Explorer
- Clock: 10000000 Hz
CTW-SPMS — Programmable Smart Power Management & Supervisor
CTW-SPMS is a 100% digital SKY130 power supervisor for Tiny Tapeout TTSKY26c. It filters an externally digitized power metric, classifies available power, sequences four supervised rails, controls three priority loads, and shuts every output down through an explicit fail-safe override after a critical fault.
User interface
The fixed Tiny Tapeout pins provide PG1..PG4, OVERCURRENT, OVERTEMP,
WATCHDOG_IN, external force shutdown, four rail enables, three load enables,
FAULT, and a four-wire SPI interface. Only uio[0] is driven, as SPI_MISO;
uio_oe is always 8'h01.
SPI is Mode 0, MSB first, at up to 2 MHz. Each frame contains a read/write plus 7-bit address byte and one data byte. SPI is synchronized into the 10 MHz core domain; SPI_SCLK is not used as an RTL clock.
See the repository README for architecture, sequencing, safety and retry
semantics. See docs/register-map.md for the authoritative address table,
defaults, status flags, fault codes, state codes, and zero-value behavior.
Safety summary
Reset, a hard fault, force shutdown, or inactive synchronized Tiny Tapeout
ena makes all final rail/load enables zero. FAULT_LOCK additionally guarantees
FAULT=1. All asynchronous single-bit inputs pass through explicit 2-flip-flop
synchronizers. PG assertion and deassertion both require consecutive sampled
100 us ticks, so short glitches in either direction do not change qualified PG.
The design contains no generated/gated clock, functional initial block, delay statement, multiplier, variable divider, inferred memory, CPU, analog block, UART, I2C, PMBus, or PWM.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | PG1 | RAIL1_EN | SPI_MISO |
| 1 | PG2 | RAIL2_EN | SPI_CS_N |
| 2 | PG3 | RAIL3_EN | SPI_SCLK |
| 3 | PG4 | RAIL4_EN | SPI_MOSI |
| 4 | OVERCURRENT | LOAD1_EN | |
| 5 | OVERTEMP | LOAD2_EN | |
| 6 | WATCHDOG_IN | LOAD3_EN | |
| 7 | FORCE_SHUTDOWN_EXT | FAULT |