36.14 TWI
Symbol | Description | Condition | Min. | Typ. | Max. | Unit | |
---|---|---|---|---|---|---|---|
fSCL | SCL clock frequency | Max. frequency requires the system clock running at 10 MHz, which, in turn, requires VDD = [2.7, 5.5]V and T = [-40, 105]°C | 0 | - | 1000 | kHz | |
VIH | Input high voltage | 0.7 × VDD | - | - | V | ||
VIL | Input low voltage | - | - | 0.3 × VDD | V | ||
VHYS | Hysteresis of Schmitt trigger inputs | 0.1 × VDD | 0.4 × VDD | V | |||
VOL | Output low voltage | Iload = 20 mA, Fast mode+ | - | - | 0.2 × VDD | V | |
Iload = 3 mA, Normal mode, VDD > 2V | - | - | 0.4 | ||||
Iload = 3 mA, Normal mode, VDD ≤ 2V | - | - | 0.2 × VDD | ||||
IOL | Low-level output current | fSCL ≤ 400 kHz, VOL = 0.4V | 3 | - | - | mA | |
fSCL ≤ 1 MHz, VOL = 0.4V | 20 | - | - | ||||
CB | Capacitive load for each bus line | fSCL ≤ 100 kHz | - | - | 400 | pF | |
fSCL ≤ 400 kHz | - | - | 400 | ||||
fSCL ≤ 1 MHz | - | - | 550 | ||||
tR | Rise time for both SDA and SCL | fSCL ≤ 100 kHz | - | - | 1000 | ns | |
fSCL ≤ 400 kHz | 20 | - | 300 | ||||
fSCL ≤ 1 MHz | - | - | 120 | ||||
tOF | Output fall time from VIHmin to VILmax | 10 pF < Capacitance of bus line < 400 pF | fSCL ≤ 400 kHz | 20 × (VDD/5.5V) | - | 250 | ns |
fSCL ≤ 1 MHz | 20 × (VDD/5.5V) | - | 120 | ||||
tSP | Spikes suppressed by Input filter | 0 | - | 50 | ns | ||
IL | Input current for each I/O pin | 0.1×VDD < VI < 0.9×VDD | - | - | 1 | µA | |
CI | Capacitance for each I/O pin | - | - | 10 | pF | ||
RP | Value of pull-up resistor | fSCL ≤ 100 kHz | (VDD - VOL(max)) /IOL | - | 1000 ns/(0.8473 × CB) | Ω | |
fSCL ≤ 400 kHz | - | - | 300 ns/(0.8473 × CB) | ||||
fSCL ≤ 1 MHz | - | - | 120 ns/(0.8473 × CB) | ||||
tHD;STA | Hold time (repeated) Start condition | fSCL ≤ 100 kHz | 4.0 | - | - | µs | |
fSCL ≤ 400 kHz | 0.6 | - | - | ||||
fSCL ≤ 1 MHz | 0.26 | - | - | ||||
Start | - | 2.1 | - | TSCL | |||
Repeated start | - | 3.1 | - | TSCL | |||
tLOW | Low period of SCL Clock | fSCL ≤ 100 kHz | 4.7 | - | - | µs | |
fSCL ≤ 400 kHz | 1.3 | - | - | ||||
fSCL ≤ 1 MHz | 0.5 | - | - | ||||
tHIGH | High period of SCL Clock | fSCL ≤ 100 kHz | 4.0 | - | - | µs | |
fSCL ≤ 400 kHz | 0.6 | - | - | ||||
fSCL ≤ 1 MHz | 0.26 | - | - | ||||
tSU;STA | Setup time for a repeated Start condition | fSCL ≤ 100 kHz | 4.7 | - | - | µs | |
fSCL ≤ 400 kHz | 0.6 | - | - | ||||
fSCL ≤ 1 MHz | 0.26 | - | - | ||||
- | - | 3 | - | TSCL | |||
tHD;DAT | Data hold time | fSCL ≤ 100 kHz | 0 | - | 3.45 | µs | |
fSCL ≤ 400 kHz | 0 | - | 0.9 | ||||
fSCL ≤ 1 MHz | 0 | - | 0.45 | ||||
tSU;DAT | Data setup time | fSCL ≤ 100 kHz | 250 | - | - | ns | |
fSCL ≤ 400 kHz | 100 | - | - | ||||
fSCL ≤ 1 MHz | 50 | - | - | ||||
tSU;STO | Setup time for Stop condition | fSCL ≤ 100 kHz | 4 | - | - | µs | |
fSCL ≤ 400 kHz | 0.6 | - | - | ||||
fSCL ≤ 1 MHz | 0.26 | - | - | ||||
- | - | 2 | - | TSCL | |||
tBUF | Bus free time between a Stop and Start condition | fSCL ≤ 100 kHz | 4.7 | - | - | µs | |
fSCL ≤ 400 kHz | 1.3 | - | - | ||||
fSCL ≤ 1 MHz | 0.5 | - | - | ||||
- | - | 2 | - | TSCL |
Symbol | Description | Condition | Min. | Typ. | Max. | Unit | ||
---|---|---|---|---|---|---|---|---|
tHD;DAT | Data hold time | Host(3) | fCLK_PER = 5 MHz | SDAHOLD = 0x00 | - | 800 | - | ns |
SDAHOLD = 0x01 | 830 | 850 | 950 | |||||
SDAHOLD = 0x02 | 830 | 850 | 950 | |||||
SDAHOLD = 0x03 | 830 | 850 | 1270 | |||||
fCLK_PER = 10 MHz | SDAHOLD = 0x00 | - | 400 | - | ||||
SDAHOLD = 0x01 | 430 | 450 | 550 | |||||
SDAHOLD = 0x02 | 430 | 450 | 580 | |||||
SDAHOLD = 0x03 | 430 | 550 | 1270 | |||||
fCLK_PER = 20 MHz | SDAHOLD = 0x00 | - | 200 | 220 | ||||
SDAHOLD = 0x01 | 230 | 250 | 350 | |||||
SDAHOLD = 0x02 | 260 | 450 | 580 | |||||
SDAHOLD = 0x03 | 380 | 600 | 1270 | |||||
tHD;DAT | Data hold time | Client(4) | All frequencies | SDAHOLD = 0x00 | 90 | 150 | 220 | ns |
SDAHOLD = 0x01 | 130 | 200 | 350 | |||||
SDAHOLD = 0x02 | 260 | 400 | 580 | |||||
SDAHOLD = 0x03 | 390 | 550 | 1270 |
Note:
- These parameters are for design guidance only and are not covered by production test limits.
- SDAHOLD is the data hold time after the SCL signal is detected as low. The actual hold time is, therefore, higher than the configured hold time.
- For Host mode, the data
hold time is whatever is largest of the following:
- 4 × tCLK_PER + 50 ns (typical)
- SDAHOLD configuration + SCL filter delay
- For Client mode, the hold time
is given by:
- SDAHOLD configuration + SCL filter delay