Active Errata List
•
Power-down Mode Current Out of Specification in ROMless Mode
•
Power-fail Threshold Out of Specification
•
TWI Data Transmission in Slave Transmitter Mode
Errata History
Lot Number
Errata List
All lot numbers affected
1, 3
All TSC8725G2D EPROM devices are affected
2
8051
Microcontrollers
Errata Description
1.
Power-down Mode Current Out of Specification in ROMless Mode
IPD is out of specification when EA pin is tied to a low level. The ROMless products
and EPROM and ROM products used as ROMless (EA = 0) are consuming extra
current in power-down mode. Table 1 below shows the power-down current maximum value and specification for high speed in low voltage versions.
TS80C251G2D
TS83C251G2D
TS87C251G2D
Table 1. DC Characteristics – TA = -40 to +85°C
Symbol
Parameter
Max Spec
Max Value
Units
IPD
Power-down
Current
20
35
µA
IPD
Power-down
Current
10
20
µA
Test Conditions
Errata Sheet
VRET < VDD < 5.5V
VRET < VDD < 3.6V
Workaround
None.
2.
Power-fail Threshold Out of Specification
The tolerance on the power-fail reset voltage threshold is out of specification. The
device may never exit reset at power-up when power-fail reset is enabled.
Workaround
Some devices may need a higher voltage to exit reset. The RSTD bit has to be set
in POWM register to disable the Power-fail Reset detector before the voltage is
reduced.
3.
Two-wire Interface Data Transmission in Slave Transmitter Mode
When in slave transmitter mode, if the slave transmits data starting with a low
level on the bus (MSB is logic 0), data set-up time is not respected and leads to a
bus error.
Workaround
The workaround proposed consists in removing the set-up violation by stretching
the SDA line (P1.7) when the MSB of the data to transmit is logic 0. This
workaround must be implemented in states A8h, B0h, and B8h when data is written to the serial data register (SSDAT).
Rev. 4179B–8051–10/02
In assembler the workaround is:
mov
A,data
;read data to transmit
mov
SSDAT, A
;load transmit buffer
jb
ACC.7,Msb_tst
;test MSB
clr
SDA
;stretch data line (P1.7) to low level
Msb_tst:mov
setb
SSCON,#40h
;or 44h: clear SSI flag
SDA
;data line is now driven by controller
In C language, the workaround is:
SSDAT = data;
//load translit buffer
if(!(data&0x80))
//test MSB
{
SDA = 0;
//stretch data line (P1.7) to low level
}
2
SSCON = 0x40;
//or 0x44: clear SSI flag
SDA = 1;
//data line is now driven by controller
TSC8x251G2D Errata Sheet
4179B–8051–10/02
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4179B–8051–10/02
/xM