TMP1827 datasheet(7/68 Pages) TI

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7.6 1-Wire Interface Timing

Over free-air temperature range and VDD = 1.70 V to 5.5 V (unless otherwise noted)

STANDARD MODE

OVERDRIVE MODE

UNIT

MIN

MAX

MIN

MAX

BUS RESET AND BIT SLOT TIMING

tRSTL

Host to device bus reset pulse width (Figure 7-1)

(1)

480

560

µs

tRSTH

Device to host response time (Figure 7-1)(2)

480

µs

tPDH

Device turnaround time for bus reset

response (Figure 7-1)

µs

tPDL

Device to host response pulse width (Figure 7-1)

240

µs

tSLOT

Bit slot time (Figure 7-2, Figure 7-3)

120

µs

tREC

Recovery time (Figure 7-2, Figure 7-3)

µs

tGF

Glitch filter width (Figure 7-6)(3)

0.48

0.025

µs

Fall time

100

BIT WRITE TIMING

tWR0L

Host write 0 width (Figure 7-2)

120

µs

tWR1L

Host write 1 width (Figure 7-2)

µs

tRDV

Device read data valid time (Figure 7-2)

µs

tDSW

Device read data window (Figure 7-2)

µs

BIT READ TIMING

tRL

Host drive read bit slot time (Figure 7-3)

µs

tRWAIT

Host wait time before read data sampling

window (Figure 7-3)(4)

tRL+tRC

µs

tMSW

Host read data sampling window (Figure 7-3)

tRL+tRC

µs

(1)

In bus powered mode, extending the tRSTL above 600 µs may cause the device to power on reset

(2)

The tRSTH is the maximum time the host must wait to receive a response from the furthest device, taking into account the propagation

delay and recovery time for all the devices.

(3)

The glitch filter timing applies only on the rising edge of the SDQ signal

(4)

The tRC time is defined as the time taken for the bus voltage to rise from 0V to minimum VIH of the host. This is a function of the bus

pullup resistor and parasitic capcitance of the trace or cable.

7.7 Security Engine Characteristics

Over free-air temperature range and VDD = 1.7 V to 5.5 V (unless otherwise noted)

MIN

TYP

MAX

UNIT

tHASH_DATA

Computation time for SHA-256 hash calculation for data size of 8 bytes

355

µs

tDECOMMISSION

Time for decommission of the device

130

IDD_HASH

Hash computation current

TBD

µA

7.8 EEPROM Characteristics

Over free-air temperature range and VDD = 1.7 V to 5.5 V (unless otherwise noted); Typical specifications are at TA = 25°C

and VDD = 3.3 V (unless otherwise noted)

MIN

TYP

MAX

UNIT

tPROG

Programming time for 8-byte data word in user EEPROM

13.2

Programming time for register copy to EEPROM

26.4

tREADIDLE

Idle bus time for EEPROM 8-byte data word fetch

400

µs

IDD_PROG

Programming current

178

TBD

µA

Data Retention

at TA = 125°C

years

at TA = 150°C

years

Endurance

For erase and program cycles

1000

20000

cycles

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TMP1827

SBOSA15 – SEPTEMBER 2022

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